build your own or have someone build it for you. i hate dells and every other manufacturer of computers. you dont get the windows 7 cd, you get a dell copy with all their crap on it, are they still password protecting the bios?
since you're on a budget get a lesser rig made and just overclock it.
i have a qx 6800 and i just overclock it from 2.93 to 3.5 ghz and it's plenty fast enough for me. I used to clock them to extremes for benching but this one is just a daily rig that has been stable for a couple years now i guess.
edit: here is an aricle i wrote some time ago about the benefits of overclocking you may find interesting, or if nothing else educational
http://www.cryo-laboratory.com/forum...rclocking.html