No real exotics? That's kind of dumb.. I could understand ruling out specific models like supercars such as McLaren, SLR McLaren, Porsche Carrera GT and such.
Regardless, I'd still want to pick a Porsche, either GT3 or just a 911 TT.
But from your limitations I would try to narrow it down to.
MKIV Supra TT
new Lotus Elise
But it would probably boil down to NSX vs. MKIV Supra vs. Viper and I'd have a feeling I'd go with the NSX just because it's so exotic looking, is meant for real driving like s-curves and it's probably pretty reliable, although the Supra is pretty good too, but played out a bit.