If you are happy to go xeon (no overclocking) and not have on-board firewire or esata then you could try something like my set-up:
http://duc.avid.com/showpost.php?p=1815330&postcount=67
Running fine for over a month now.
I
think it works because the chipset has native PCI support, and doesn't support CPU integrated graphics.
Good luck!