Andre Iguodala and Danny Granger seems to be a hot debate and monopolized the digital ink amongst most Kings fans on StR over the past few months. However, Rudy Gay's name is starting creep up a bit. The thing that all 3 of these names have in common are that all are considered elite level SF's on rather large contracts. Witthout pulling a ton of stats into this conversation I think the consensus would agree that Iggy is a great passer/playmaker and uber-atheltic, Granger is considered a strong 3 point threat/scorer but that Gay is kind of a hybrid between the two player.

It's interesting to look at Rudy Gay's stats last year:

http://www.nba.com/playerfile/rudy_gay/career_stats.html

They almost mirror those of Danny Granger:

http://www.nba.com/playerfile/danny_granger/

Here's Iggy's stats to compare as well:

http://www.nba.com/playerfile/andre_iguodala/

However, some incentives to Gay are that he's 3 years younger, more athletic and probably has time to continue to improve upon what he's already shown. 

I really want strong defense, ball-handling and strong perimeter shooting from my SF on the Kings.

Iggy provides the D and the ball-handling, but his lack of size is troublesome along with his inability to hit the 3 consistently. 

Granger's more of a Kevin Martin-eque star(with D) in the fact that's he's a tremendous scorer with near unlimited range. However, he's already 28 years old and smack dab in the middle of his prime as a basketball player. What you see is what you get, and that's pretty darn good. 

Enter Rudy Gay. He just signed an enormous Maxed out deal with the Grizz last summer and IMPROVED upon seasons past. He's got the Size and Range of Granger, and interestingly he's got the Defense to go with it. What's the best metric to rate defense? That's debateable. I really don't have the answer for that. However, I do think A good metric is that of Adjusted (+/-).

I found a nice site that helped me to evaluate some of these metrics and use them to compare these 3 players. Here's the link:

http://rotosynthesis.rotowire.com/Best-Wing-Players-in-the-NBA-by-the-Numbers-BBD2766.htm

 

What I found interested was this portion below:

2-year Adjusted +/-: This is Basketballvalue.com's APM calculation.  As I mentioned above APM is so incredibly noisy that a single year (or less) doesn't give conclusive answers (and too often the answers are nonsensical for my tastes).  Even 2 years may be too short for an APM calculation.  I like longer APM calculations, 4 years or more, to really clean up the noise and give a robust effect.  Nevertheless, we're talking about this year so we'll have to make due on both issues with the 2-year compromise.

	2 yr APM	2 yr APM SE
LeBron James	15.05	2.71
Kevin Durant	12.38	3.9
Dwyane Wade	11.01	3.27
Luol Deng	7.6	3.62
Gerald Wallace	6.98	3.33
Landry Fields	6.87	4.33
Paul Pierce	4.91	3.44
Manu Ginobili	4.83	2.92
Vince Carter	4.8	3.27
Carmelo Anthony	4.63	3.11
Ray Allen	4.17	3.54
Danny Granger	3.34	3.02
Kobe Bryant	2.86	3.7
Ron Artest	2.83	3.26
Rudy Gay	2.77	3.72

 

Gay is about on par with Granger and Iggy isn't even mentioned in the top 15 wings for this particular metric.

 

The next best part of this find was this mentioned below:

Overall Rank orders: Giving each of our 27 guys a '1' through '27' ranking based on where they ranked in each stat, here is a summary of how each guy did.  I'll add an average across the 5 stats (with standard error) to give us a seat-of-the-pants-advanced-stat-cross-section-view ranking order:

	PER	WS48	WP48	Roland Rating	2 yr APM		Average	Std. Error
LeBron James	1	1	1	1	1		1	0.00
Dwyane Wade	2	2	2	3	3		2.4	0.24
Kevin Durant	4	6	6	6	2		4.8	0.80
Manu Ginobili	6	4	5	2	8		5	1.00
Paul Pierce	9	3	7	4	7		6	1.10
Kobe Bryant	3	5	8	7	13		7.2	1.69
Ray Allen	15	8	9	11	11		10.8	1.20
Eric Gordon	8	9	13	8	16		10.8	1.59
Carmelo Anthony	7	17	12	9	10		11	1.70
Rudy Gay	11	14	11	5	15		11.2	1.74
Kevin Martin	5	7	14	12	26		12.8	3.68
Andre Iguodala	14	10	4	13	23		12.8	3.09
Landry Fields	25	18	3	14	6		13.2	3.99
Luol Deng	20	11	17	19	4		14.2	2.99
Joe Johnson	12	19	16	10	17		14.8	1.66
Danny Granger	13	15	23	15	12		15.6	1.94
Andrei Kirilenko	16	16	10	17	19		15.6	1.50
Gerald Wallace	21	21	15	18	5		16	2.97
Vince Carter	23	20	20	16	9		17.6	2.42
Jason Richardson	18	13	18	22	20		18.2	1.50
Richard Jefferson	26	12	19	21	21		19.8	2.27
Monta Ellis	10	22	21	20	27		20	2.77
Jason Terry	19	23	26	23	18		21.8	1.46
Ron Artest	27	24	25	26	14		23.2	2.35
Michael Beasley	17	26	27	25	24		23.8	1.77
Stephen Jackson	22	25	24	27	22		24	0.95
Tyreke Evans	24	27	22	24	25		24.4	0.81

Conclusions:

Every stat, no matter how it was measured, agreed that LeBron James has been the best wing in the NBA this year.  In fact, LeBron and Dwyane Wade measured out 1-2 overall among wings across the body of stats examined here.

Behind the Miami boys is a group of 4 guys on the next tier: Durant, Ginobili, Pierce and Kobe.  While Kobe and Durant are super-duper stars, it's interesting that Ginobili and Pierce measured right there with them this year.

Ray Allen is right behind Kobe, and highlights the next Tier that features eight guys (down to Luol Deng on the list).  This tier is an interesting mix of big names and guys that may be having a bigger impact than their names would suggest.  New Knick Carmelo Anthony is on this tier with Ray, along with several young scorers (Gay, Gordon, Martin) and a couple of more versatile glue/defensive type players (Iguodala, Deng and Fields).

I'm not going to spend much time with the rest, though it is interesting that guys like Joe Johnson and Monta Ellis are maybe further down the list than you might expect.  The take-away for me is that while Miami (obviously) is built around 2 super-wings, the Celtics (and I guess, now, the Knicks) are the only other teams with two wings from among the top 3 tiers.

So no matter how we compare the players, they're all about neck and neck with each other and Rudy compares favorably with both Granger and Iggy. He's kind of the best of both worlds between the Iggy crowd and the Granger crowd and he's younger than both, which will help as our team matures together.
Overall ranks had Gay at @11, Iggy @ #13 and Granger @ #17.
Now it's just a matter of who's available and at what cost. Iggy IS available, Granger apparently is NOT available(according to Indy fans and their ), and Gay MIGHT be available considering Memphis' financial situation. 
The addition of Gay would give the Kings two top 30 wings on their roster along with Tyreke. We have a future al-star in the making in the front-line in Cousins and we'd have a nice complement of role players in Daly(if re-signed), Thornton(will be re-signed), Beno, Garcia, Greene and Thompson.
So without further adieu I'd like to suggest we deal the #5 pick, Omri Casspi and our cap space to the Grizzlies for Rudy Carlton Gay Jr. doing so would enhance our roster and give us an athletic wing that can D it up, hit the 3 ball and throw down some ridiculously awesome dunks to re-ignite  PBP ARCO THUNDER once again!
Kings roster after the addition of Gay would be:
C: Samuel Dalembert, Hassan Whiteside PF: DeMarcus Cousins, Jason Thompson, Darnell Jackson
SF: Rudy Gay, Francisco Garcia, Donte Greene SG: Tyreke Evans, Marcus Thornton, Jermaine Taylor PG: Beno Udrih, Charles Jenkins, Pooh Jeter
Overall salary commitments assuming Daly gets 10 million annually and Thornton gets 6 million annually for next season would be roughly 60-62 million dollars next season after filling out the roster with the Darnell Jackson's, Pooh Jeter's and Jermaine Taylors and adding a 2nd rounder like Charles Jenkins.