alienware is dope if youve got 3 grand to throw into a system, most people dont. Dont buy Dell. You get what you pay for, a good processor/decent harddrive/cheap flatpanel monitor, and the rest of the components are no-name budget shit, plus dont EVER get an integrated graphics card. Toshiba and apple are good calls. Emachines isnt bad either, for the price theyre good comps with decent components.....or build your own:
http://www.newegg.com