If you want the best I'd get a PC Power and Cooling power supply. The only one I ever bought from them was for an Everex Step 386-25 DX Novell server in the early 90's.... Worked very very well.
Also for all the really anal people in the powersupply forum, highly recommended is an APC 1200...
I got the ASUS A8N-SLI Premium form the Egg. I didn't realize I needed a new powersupply with 24 pins.
My Rig Specs Are:
ASUS A8N-SLI Premium
AMD X2 4200+
2x512Mb Corsair XMS
74Gb SATA WD Raptor
80 Gb PATA Seagate
Sony CD-R
NEC DVD-R
1.44 & 5.25 floppies (yes I know!)
Seagate...