Whats a good sports car for an experienced manual driver?

I currently have a 06 Tiburon GT with a cold air intake and exhaust system, but gettin tired and bored of it already...if you had 30,000 cash and was lookin to upgrade to something faster and better lookin what would you go for and why? I was thinkin either the Mazda Rx8 r3, or a Nissan NISMO 370z, and eventually puttin a supercharger/turbocharger kit onto it. Thanks