I currently have a computer from Cyber power inc. (www.cyberpowerinc.com) and love it, Hasn't given me any troble as of yet.
They are also running some deals due to school comeing about
check out this AMD Rig.
Gamer rig for 775 of course no monitor. but use the extra you would spend on a dell get a nice monitor and maybe add a few goodies, theres a list of extras you can choose from.