Most of the onboard sound nowadays is good - not sure if sound storm is still floating around though...will have to look that one up.
About the only board that FULLY supports AGP and PCIe is the Asrock that I linked above. There are s939 AGP boards, but the option for future PCIe is a true consideration. Do you have an AGP card that you're thinking about throwing in there? If you're buying a vid card, then go ahead and get PCIe...
Here's the thread I was telling you about. It was in the Homebuilt section...Let me your questions in here.