Hi, a selection here.
Personally, I think you are looking at this from the wrong angle. Do some research and decide what cpu fits your requirements. Decide whether or not you want a motherboard with PCI Express or the standard AGP socket.
Now see what motherboards fulfil those options. You may even find one as a bundle that fits your specifications.
Just a point that may be worth considering if you want a quite system. Some motherboards use a fan for cooling the N4 chipset and these can be noisy. Others, especially with the Via chipset, use passive cooling by using a heatsink.