That will be a nice rig. Though I would try to get a 7800 series card if at all possble. Cancel one of your Gigs of RAM and see if that allows you some money space for the 7800 card.

Granted, you want and need 2 Gigs of RAM in some games, but IMHO, you'll have more fun with the better video card than with the extra memory. You can always add to the RAM later. It's easier and cheaper than changing video cards.