I would advise you getting a power supply that is so cheap. I've been burnt MANY times by those cheap power supplies. I recently bought a POWMAX 400W ATX power supply, and it burnt out EVERY time, even when the company replaced it. Right now, I'm running my system with an old 250W power supply and it has NEVER failed once, and it's more than 5 years old!! Be aware, I have: 80GB hard drive, DVD & CDRW drives, 2x256mb Crucial PC133 SDRAM, Geforce2 MX400, 5 system fans, and 3 PCI cards. Doing some recent power supply calculators, I should have at LEAST 350W to be safe. But this 250W power supply is just THAT good. Just because you can get a 400W power supply for $20 doesn't mean that you should. Go for something that is in the $40 and above range. Also, usually the heavier they are, the BETTER they are.
A good place to search for some 400W ATX power supplies is on http://www.pricewatch.com. Look for those primarily above $40-$50. It'll save you having to ship the power supply back and forth to the company over and over again.
you get 400 watt ATX power suplies in the $20 or so price range.
Read a post by you many montha ago but can't find it now. May have been in the former forums.
TIA

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