Power supply suggestions for K7N2G-ILSR

Can anyone offer suggestions for a good solid pwr supply for this board? I recently bought a low-end one and believe it may be my problem. What I have and will be returning is a Raidmax 400w. The specs are:
Model PM-S400W ATX12V
Input: 115VAC/230VAC 12A/7A 60Hz/50Hz
+3.3V, +5V, +12V, -5V, -12V, +5Vsb
28.0A, 30.0A, 15.0A, 0.5A, 0.8A, 2.0A
Suspend mode: Under 27W
Sleeping mod: Under 30W
That's about all the info I have on this PSU.
K7N2G-ILSR NForce2
AMD 2400+
Seagate Barracuda V Serial ATA (80gig)
2 X 256 Mushkin Enhanced PC-3200 DDR
LightOn 52X CD-RW
Radeon 7000 Pro 128 mg DDR

After many attempts to get games to run, upgrading bios, drivers ete.... I was able to get MSI Tech Support on the phone.  We tried changing bus speeds, swapping memory, with AGP card w/o etc....
Nothing seemed to work.  The tech guy basically told me to RMA the board back with the reseller.
After doing that, I looked more into what else could cause the problem.  I had already purchased new memory because I was using Kingston 512 2700 DDR, and purchased the Mushkin 2 X 256 PC 3200.  More and more research pointed to the power supply.  So I may have jumped the gun by sending the board back without researching fully what could cause the problem.  I guess you live and learn.   ?(

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