TK2 is quite nice (and the TK1 is really nice), but you asked about the TK3...was that a typo?
I'd probably go Felt over Fuji-- IIRC fuji had some problems with crank clearance last year.
And I wouldn't rent for long, but it's a good way to get onto the track and check out bikes without having to rush to buy. And if price is a major driver, I'd see what people at the track are selling. You can still get some decent deals on used bikes, though they tend to go fast now that fixed is popular on the street.
Last edited by bitingduck; 03-17-10 at 06:49 PM.