With the cars coming out now, take your pick of drivetrain. They're all affordable, although, I think rwd drive doesn't really exist anymore with the new sport compact cars coming out(in the U.S.) w/4 cylinders. If your trying to achieve 13s with spending the least amount of money, opt for the wrx. Or if thats to cheap, just get an STI or EVO.
There is a pair of blue wrxs down here in hawaii which are running consistent 13s. One of them hit 12s because he threw a larger turbo/intercooler package in. But from what I heard their mods are minimal(other than the 12s guy). I've seen these cars run these times at our local drag strip.
