gt4 is getting a little boring, but its mostly because i lack the funds. i love racing on the "burg." ive yet to get any leman prototype I, R8, GT-One, etc...
it depends on the track and stuff like that. some cars are more well suited for certain tracks, like a type-r and 330si. the bmw would clear win a track that has long straights because of power, but the type-r would win on a track with lots of tight corners. i consider the mclaren f1 as number one because it won numerous times a lemans and even did a couple of 1-2 wins and some other wins, an thats overrall, not just class. like how they consider the skyline the godzilla because it got banned from group a racing or something and won at nuringburg endurances.