It's probably about the best value out of the box used sports car going. And since you can find ones that haven't been prison raped, you can get a pretty decent ride for not a lot of scratch. I don't know anything new in the 30s that even close. My only demerits for the C6Z are that it would be another GM, not exactly rare (neither is the TP) and I'm sort of getting whinny about stick shift for traffic. Mine is heavy and it's annoying after a while. Especially combined with poor warm start idle seek weirdness, which doesn't help.
I love love love the 2015 Turbo Porsche. But that's just a tad more.