Lawl you post this and sidebar ads bout "intel: customize your gaming pc" come up. Smart ads FTW.
Just ask the guy at your local Fry's. Go there, and you'll find what you need for sure.
I could make a list, but it would just conflict with others.
basic requirements imo:
-fairly new nvidia/ATI card (personally, nvidia overheats too fast, ATI has a big ass fan and nvidia's is tiny.)
-dual-core processor. not getting one is shooting yourself in the foot.
- BIG FAN. I cannot stress this enough. playing GTA4 all settings max with about a hundred mods running at 1920x1280 WILL burn out something if you don't have an enormous fan. Liquid cooling works better, but I'm not a fan. bad experiences with kicking my comp.
Problem is, you will never get a great gaming PC if you don't make it yourself. Buy the high quality parts, and put em together in a mid/large tower case. Best advice though: don't try. don't sue me if you try and fail and break something.