Wait I thought you were going to make this strictly a track car? If so, I vote hatch for the smaller size. I have considered getting a 5th gen hatch strictly for a track car, however there arent really any autox tracks around here. But if I were, my plans would be totally strip it, LS swap because they can be had for pretty cheap, build that a little for turbo, and then boost. All that in a little hatch, with the right suspension work, would make a mean track car.