Get a Radeon 9800 Pro instead (the 256-bit version). Your motherboard is only 4x but you won't notice a big difference between the card on a 4x motherboard and an 8x motherboard. That regular 9800 is a POS.
Why are you upgrading? If you're not gonna play games then there's no reason to. If you are, then upgrading is worth it.
I'd buy that RAM you listed. It'll work fine unless it comes defective or something. The extra RAM will not improve your performance by much in Windows XP but it will improve game performance by a large amount. Most people underestimate the performance increase of adding an extra 256 MB to the current 512 MB of RAM.
About the PSU...it would work, but only if your case will allow it physically. If your case is shaped oddly inside or is rather small then that PSU might not fit in it. I'd be taking measurements or just scoping out the inside to see if the PSU is a regular sized one or not.
If ya have any more questions just ask!
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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