If cost is a factor that rules the Ls600 out so you are now down to a CT200 sorry I think they have 17" wheels though!
I'm not too keen on the CT200, I may just wait till i turn 25 and get the is-F, i love that car!
Im really looking for speed and power, yeah i know your probs thinking, hes insane, but i am young.
other than that, maybe the gs350, but that rather large, who knows :)