While your waiting for more feedback put this in at google
PC Hardware Buyer's Guide September 2010
That will take you to a UK site with their current pick of parts for a budget build or a gaming build ect ect ......
go with that, but instead of the case and psu,
buy the Xigamtek £28 case, and corsair CX400W PSU, then you can be sure you have a quality power supply.