Okay, first off you should get a case with a huge window and chuck in a 100watt globe in there :P
Seriously, here's the real deal:
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STUFF I'M NOT SURE OF
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Motherboard:ABIT AB9 Motherboard i965 - $220Besides being compatible with the Pentium 4 series chips, it's also compatible with the Core 2 Duo processors if you ever decide to upgrade it. Feel free for anyone else to point out a better model but I've heard this one's pretty good and it's got Intel® Quiet System Technology (Intel® QST)
3D card:GeForce FX 6600 256MB - $212
A semi-powerful 3D card. It can do a bit of gaming and photoshop programs.
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STUFF I'M SURE OF
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Ram:Corsair 1GB TWINX-3200C2, CAS2 DDR RAM - $199Storage:Seagate 320GB SATAII HDD - $139Sound:Creative Audigy - $55DVD burner:Pioneer DVD burner - $45 Case:Antec Sonata II (with PSU) - $175.Good for the quiet person
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TOTAL $1045
Okay, now despite the cost it can be adjusted. If there's someone who has better knowledge on compatibility with motherboards and 3D cards you could knock off around $100 I think. Everything else listed though is pretty essential