I use a MSI-NEO2 which is a 939 board nf3 with agp... I don't suggest it, doesn't o/c as well as I would like. AGP is out the door soon enough anyways.
Go with something that has AGP and a PCI-E slot with 939 (as it sounds as though you don't have a PCI-E video card yet). That way you can upgrade your video card in the future and not your motherboard. The one that comes to mind is this...
ASrock 939dual
Seems to be a stable overclocker, I have played around with it some on my girlfriends pc. Good stuff. Hell I am even thinking about one too replace this.