Case (with fans)
Power Supply
mobo
Processor (x3 or x4 is more than enough)
http://www.cpubenchmark.net/ for comparing
Processor cooler if not a retail processor or overclocking
Optical Drive
Hard Drive/s
Video Card (one of the new units that bit streams audio over hdmi )
Memory
You can get a good sub 500-600 build
For the performance and price Ive got no issues using AMD. Go to newegg and start playing around building systems in your "wish list", then post the link to it and we all can peak
edit: I havent been a "barebones" kit person, just never liked their combos