I'd wait until spring, Intel's going to release 2 more chipsets 1 being the springdale. They are more optimized for home-use than the granite-bay chipset and will support ddr2700 in dual-channel.
Upgrading just for 8x agp isn't worth it, and in my opinion unless yer running a server neither is getting a granite-bay chipset, only ddr 2100 support
