I have since ordered a Power supply
CORSAIR CMPSU-850TX 850W

And a Video card .
GeForce GTX 470 (Fermi)


And a new SSD.
OCZ Agility 2 OCZSSD2-2AGTE60G 2.5" 60GB SATA II MLC Internal Solid State Drive (SSD)


Hopefully this will complete my build.

Thanks for the reply.