I think this is better:
Dimension E310 Desktop + 17" LCD $464, Mar 29
Dell Home has the Dimension E310 Desktop + 17" LCD for $499 - $35 off $300 coupon ($2 at ebay) = $464 with free shipping.
* P4 2.8GHz w/ HT, 256MB, 80GB SATA, DVD/CD-RW
* 17" E176FP LCD, XP Media Center, 1 year warranty
Just add your own GPU ! and more ram ofcourse.