I like how the case is cheap, this leaves more money for other things

So... ~£750 for CPU+cooling, mobo, RAM, graphics card, DVD drive, for 600W..
i7 930@£230
UD3R@£153
Corsair 6GB RAM@£140
Graphics card is tricky, the logical choice is the 5770 but that's no good for folding. Closest is the GTX260 but they're all out of stock.
Let's go with 2xGTS 250@£89 each, although it's running a little close to the wind, you might be happier with a bigger PSU

And.. a CoolIt Eco ALC CPU cooler @ £56
Also, that OCZ phase cooler looks awesome

although I'm not a fan of their 30-day warranty.