Engine,I just built a +3500 AMD puter,and for the longest time I was going to go with the MB you have.I found out it is very fussy about PS,so I opted for the Asus A8n SLI board.What I would recommend is prolly a Antec Pure Power,as they seem to work well with SLI boards.Dumb me I bought PS before I got the other goodies,and a Coolermaster 450 wouldn't do well with MSI.What the other gents are saying is very true.Get a lot of wattage,as these new puters need a lot of juice.The 24 pin power hookup is also very important,as a lot of board makers don't recommend using a 20-24 pin adapter,Hope this was helpful for you.
IronDog
AMD +3500 Thermaltake 1838 fan-heat sink
Asus A8N SLI MB
MSI GT6600 PCI Express card
1 gig Corsair ram,the xl stuff,dual channel
SoundBlaster Audigy PZ 2
WD 80 gig SATA HD
Thermaltake Tsunami case
my first AMD puter,and am I ever glad I switched from Intel. this thing rocks,and not OC'ed.I will put in another GT6600,when I can afford it.