This deal has ended.
Dell Small Business again has the Dell Vostro 200 Slim Tower for only $449 after $260 in instant savings. This features a 20" LCD monitor, 1.8GHz Intel dual-core processor, 2GB memory, 160GB hard drive, 16x CD / DVD burner and Windows XP or Vista Home Basic (I recommend XP, Vista isn't perfected yet). Upgrades are available for most components (just scroll across the icons at the middle of the landing page). Shipping is free and sales tax is charged in most states.