Well this has turned into quite the massive thread hijack, hasn't it...

I'm a bit confused here with peeps saying "XXXbhp" is more than enough, and yet there was Neil with over 500bhp in his car and no-one's said how mad or dangerous it was (so I'm guessing it wasn't!).
As Mel and others have said, you build your own car and that's all there is to it. The thing is, a 200bhp 2.5 Alfa-powered effort is always going to be loads of fun, in a wring-its-neck Mazda-MX5 type way. But a mega-power monster will also be a hoot as well (provided you're circumspect about when and where you hoof it). I have a theory that what people say they want changes in proportion to the depth of their wallet at the time...if you suddenly come into funds, that lower-powered option will soon get upgraded to something a bit more eye-opening!

I firmly believe you can never have too much power, you just need some self-control (or, as in my case, cowardice!) And just cos you can go fast doesn't mean you always have to - the throttle goes both ways!