Check out
www.Slickdeals.net for great deals on Dell computers (via rebates) and alot of other computer stuff.....Hard drives, memory, storage media etc etc
If space is a consideration you may want to consider getting a USB 2 compliant external case for your DVD. Puts the burner right on your desktop. I bought one for <$30 off a vendor on ebay. Comes with it's own power supply and fan.