Actually, i was running this:
6000+ x2
M2a-vm
3 case fans
2gb of hyperx ram
a 40gb hdd
and a geforce 6600
off a compaq 250W psu.
That's a pretty large recommendation, the recommendations should only go far what specific parts you have.
I'm now running that same rig, plus 4 more case fans, a 180gb hdd. and a 9600 overclocked ed. gfx card instead of the 6600 on a 500W.
And like most expierenced users say, it doesnt always matter abou the watts, more on the Amps. i would suggest the OP talks to either Cromewell or Bigfellla about these things.