Recommended Power Supplies?

[Major Johnson]

Ok, this is sort of a continuation of the CTD thread/poll I posted a few responses in, but my topic takes it into another area that I felt was off topic enough to warrant a new thread. Starting today I'm experiencing power shut offs while playing SH4. It started when just clicking on the load game option. It happened like 3-4 times. I had to unplug the power chord from the power supply, wait a few seconds and plug it back in, then I can turn it on and it boots up normally. I know it's graphic related in some way. Something about the game makes my video card, a GeForce 7800 GS 256 RAM (one of the few cards that has the UBI blessing of compatibility for the game! ) want more more voltage, it asks the power supply and power supply promptly shuts down. I was able to get into the options menu and switched from the High setting to Medium. I was able to load my saved game, but after 3-10 minutes the pc just shuts off again. And it can happen in any screen. This happened 5-6 times as I experimented with the graphic settings, shutting off my anti-virus etc. Believe me I've gone through all the usual troubleshooting steps. In as much as I think maybe the game engine might be able to be tweaked to be more compatible, I also think not all power supplies are alike and mine, a Xeon 600 Wt, might not be able to give what the game is currently asking of the video card. There is only one other game that causes this problem for me, and it's a game that was made for Win95! It just doesn't play nice with XP, so I have a 98 box with less of everything else (400 wt power supply) that the game runs fine on.
So I guess my question is what are the specs I should look for in a power supply that is best suited for hard core gaming. Thanks!