i am one to save money, but i am way too lazy to build one myself, ide say call around and see what kinda deals you can find, or see if you know a friend of a friend that can do it for cheap
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coolest link to get money for your old computer, ps2, xbox, camera, cd player, pda, projector, cell phones, and any other thing that is on there.... its basically free money!!!! 
http://ebay.eztradein.com/ebay/index.cfm?af=e1af4246-9c5d-4778-aee1-72d118156891