I agree with forbin, FWD can give you some seriously bad habits, but they're great to learn to race with.
As for learning some skills, the LX4 is the daddy. It's pretty raw, but that's the beauty of it. It does everything you ask of it (right or wrong) and doesn't have any peculiar habits like the RAC. the XRT's not bad either, just a little heavier and you'll find more XRTs online.
Whatever it is, make sure it's got road tyres on it. You won't get the best out of a set of slicks until you've mastered road tyres.