[fast924S]

I would go with the 951, I love to mod cars and play around and the 951 has tons of power adders. I have seen 951 from 300-500hp. If you build it right the 951 could spank a M3.
Now if you wanna start talking about the 968 turbo then I would choose that one. I also love turbos, There is nothing like the rush of power and that awsome turbo noise. turbo lag isnt a big problem, there are many ways to fix the problem and I kinda like having tons of power dumped to the wheels at 3,000rpm it just feels mean.