Buy 15" wheels? Gives you a much better (and less expensive) selection of high performance tires. Nothing like $62 Azenis to get yer heart a-thumpin'. :P
Seriously though, tailchaser and were talking about this recently, and we figured (taking Azenis as an example), that the difference in cost for 15" tires vs. 16" tires would pay for a set of average 15" wheels in three sets of tires. Plus, the taller sidewall of a 15" tire means better ride quality on those long distance hauls from East Texas.
Other than that, I can't really help you. Maybe Toyo T1-S? Think they come on 16" OEM-friendly sizes, and s'posed to be the best riding high performance tire out there. Little squishy on turn-in, but you've got race tires/Azenis for that.
Iain