Thanks for the feedback. Yeah, I was leaning GTR, but I felt like an R8 is so far out of my reach it might be cool just to say I drove one. I think I'll have more fun in the GTR though. I wanted to go for more track time over a more exotic car. (Yeah, at Exotics Racing in LV.)
If money was no object I'd be in the 458 all day, or maybe the Aventador. I didn't want to go for the Porsche because I'll be at a race track, not a Starbucks. And as someone who's never been IN a Porsche, let alone driven one, I feel I'm qualified to make that judgment.