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For performance you should be looking for light weight, and strong, wheels then going from there. 18's and 19's are probably where you want to be. 20 will be too large.
Are you planning on putting the car around a track?
What size wheels should I put on my GS 430???
I'm going STAGGERED
I want more performance then looks!!!
18's
19's
20's
You are in GA, check out the SE forums for meets in your area. I have pretty much every suspension mod on my GS and have 18s currently but will be moving to 19s or 20s shortly and still intend to "perform"
Since you want performance, the biggest would be 19's. Like Mike said, since your in Ga, you can come to a meet and see first hand some of the rides with various wheel choices. I myself have a set of HRE's, staggered in 19's on my black GS, but wanna go up to 20", so check em out and maybe we can work something out. HRE's are the best of both worlds, looks and the performance to back them up!!
What kind of performance are you speaking of? Power transfer? Handling? Braking? If you are focused on performance, in general, stay with 18s (or at most 19s). Get something lightweight. Stay close to OEM wheel diameter. Get good tires.