I found this nifty guide by "Th !e.FaLconO6" on building a nice computer for the right price. At version 0.8, it was last updated June 2nd, 2010.

2-18-2012 - UPDATE!
You can find an updated version of this guide here:
http://i1002.photobucket.com/albums/af150/The_FalconO6/CurrentLogicalPCBuyingGuide/Guide.png

More Stuff here too:
http://s1002.photobucket.com/home/The_FalconO6/index

Thanks Internet!