Thanks for the help guys. The reason i went cheapy on the psu was because i didn't have alot of money in them days and this was my first computer build. I had a look on overclockers and ebuyer (UK sites) and i brought this one
http://www.ebuyer.com/product/200491 - which blind picked out for me.
Ouch.
When getting a new computer, don't get a cheap PSU, you'll reget it later (especially if you want to overclock).
So do what EWD said.
Corsair and Enermax are good brands, too. Don't go overboard with the wattage unless you run multiple cards in SLI/Crossfire or a Fermi.
Yeah my whole idea was to go crossfire with two ATI 4850's (i have one at the moment and it's fine) but i didn't buy them because it would see better performance with a new 5850 or 5870, or even two 4870/90's. Well i have learnt my lesson!
Rig at the moment
Intel Core 2 Duo E8400 Socket 775 (3.0GHz)
Asus P5Q PRO P45 Socket 775 ATX
Coolermaster Elite 330 Black Mid Tower Case
Samsung 500GB Hard Drive SATAII x2
OCZ 4GB (2x2GB) DDR2 1066MHz/PC2-8500
Arctic Cooling AC-FRZ-7P Freezer 7 Pro Socket 775
Sapphire HD 4850 512MB
Samsung SH-S223 22X DVD±RW/RAM/DL
LEGAL (Yeah i know about your version!) windows 7
1 back 120mm fan and a front 120mm fan
Hi-Power Black 800W 14cm Blue LED Fan PSU - 20+4pin 4x SATA 4x PCI-E - PIECE OF SHIT!