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I would just like to chime in on the other end of this crowd.
I currently am running a Athlon 64 3400+ with a Geforce 6800 (non-ultra) off of a cheapo 250-watt powersupply from CompUSA. It was the cheapest power supply availible that had the extra four pin 12V connector.
It has been in my system for about a year, and has done great. The voltages are all stable, and after I cut off the back grill fan cover (air blowing accross a flat plane doesn't make it efficient), it has been a quiet, reliable and fairly-cool running power supply.
So basically, what I am saying is that if your power supply is doing well, keep it. Make sure your voltages are all stable, even during load, and if so, you should be great. If you really want to give your powersupply a test, run memtest's bit-fade test, which will detect errors generated in RAM because of electrical interference. An excellent power supply will give you around 4 errors if I recall correctly.
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