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pricewatch for your processor. you should be pleasantly surprised at what you will get for what you planned to spend. go with windows XP, and if you don't plan on running 2 processors, go with home edition. memory wise, pc2700 is a good choice right now, pretty fast and not expensive. but buy brand names like crucial (micron), kingston, mushkin!, or corsair. lastly, hold off on the video card a little while, nvidia will soon release the geforce FX's, and the 5600 should be well within grasp for what you would spend on that ti 4400. i have read $150- $170.