The only DELL on sale right now is the 2400 DO NOT BUY THIS COMPUTER. It's a terrible comp with a terrible motherboard. It has NO AGP slot. It only has inigrated graphics. And if you wait a bit there should be better DELL comps sold at the same price or even cheaper.
The best deal so far was a DELL 8300 with a 9800 Pro and a 17inch CRT for $650... you get the idea. :)
Also, you probably want to check out slickdeals.net as they usually list items that are really only a good though sometimes they list things that really arenít that great.