tyan is a good board
but it has no overclocking features
none of the current MPX board have working usb (its a bug in the 768 southbridge... this bug has just recently been fixed with a new revision of the southbridge "b2")
so you have to remember that if you want usb you will need to install a usb pci card, and that takes one of the few 32bit/33mhz pci slots that the mpx boards have (most have 3 32/33 slots, some have 4)
im also about to get a dual AMD board, but im waiting for the new boards based on the new southbridge
some that im looking at
epox m762a
iwill mpx2
abit wa2a
the epox is probably at the top of my list because it will have working usb and it has onboard LAN, so the 3 pci slots will be free for other stuff
from what i hear the new boards should be showing up in stores around the start/middle of next month