My vote is for the GTP or GTX (more ponies, better looking hood). I've driven them on an autocross type track and they were one of the funnest cars that were there for us to drive. They are pretty quick, lots of torque and nice inside too.
They feel bigger than the rex, but they didn't feel as big as driving my Pontiac Formula, so somewhere in the middle. I seriously considered buying one when they first came out, I though they were the shiz... They are even faster and better looking now than they were then too.