C32 or STi or 350z? *changed*

[MercedeSChink]

i'm really interested into getting a 'race' car now, something like a c32 or else a sti...which car do you guys think would be a better track car!? the c32 is known for bad rear brakes but the brakes aren't a problem, it can be swapped...although yes i'm in love with the sti, the c32 gives a much better name cause its a benz, plus comfort is an issue also, leather interior versus the sti bucket seats and cloth interior!? the down side with and mb though is the parts part, the shit is freakin expensive, just to get some more power like lets say 50 hp, will probably cost me 4 grand while in some other car like the sti, with 1-2 grand i can get more hp than 50...