This deal has ended.
Through 2/25, a nice model of the Dell Inspiron 546 is at Dell.com for just $599. This comes with an 20" Dell HD Monitor (though it isn't pictured on the landing page) and features a 2.8GHz AMD Athlon quad-core processor, 4GB of memory, 750GB hard drive, 16x DVD / CD burner, Ethernet, and Windows 7 Home Premium. It's available in eight colors. Shipping is $12.95 with sales tax charged in most states.