I have 2 AGP S939 boards here, the Epox and the MSI, both are dual channel S939 boards based on the Nforce3 chipset. Both are great boards i must say, but i must hold a coin on the Epox between the two. Epox 9NDA3+.

dj, check with Ebay what you could sell your agp card for cause it's gonna drop very fast very soon. If you sell gear like the cpu and or the videocard every 6 months, you don't loose much when upgrading. If i didn't do like this, i could never afford upgrading all the time. I had a x800 Pro for over a year, but i only lost $30 when i recently sold it.
For the money i got 2X6600GT which i can both run in SLI or use in 2 separate rigs. My options got a whole lot better with SLI or 2 equal cards. 2X6600GT beats the hell out of most other singlecard options out there and they are pretty cheap and doesn't draw much power at all.