Help with new build

[Mangelwurzel]

If I was to build a PC around these components, what would be a decent PSU to go for. Trying to keep the cost of the build down below £600, which I suspect isn't really possible.
I started building around an Antec Sonata case to leave more cash for the other bits, but wasn't sure what power this lot would need by the end, so removed it.

TIA

edit: I have a 74GB raptor to use for OS that I can take out of my existing gaming PC. I also have a DVD RW.

 

[Mangelwurzel]

Reviews are amazing for that PSU. Just need to save a few more pennies for a case now.

 

[Mangelwurzel]

drop to a cheaper cpu and overclock, an e2160 or e4400 will go practically as fast as a e6750, at a much reduce cost, when clocked to the same speed.

But what if I overclocked the E6750, wouldn't there be a significant performance difference between the two then?