I would go and test drive some. They are very smooth and even the standard engine will be perfectly able to drop the back end out much easier than you think. In terms of power speed your in m3 territory with a few mods like decats, y-pipe, exhaust and remap. Zmanalex has the beast of the forum which was running around 600 at the wheels and will be more next season. I'd drop him a pm for a chat and speak to him about it.