Why do you want a board like that with 3 pci-e x16 slots? Please explain your situation, as the Xeon line of processors is meant for workstation/server work, not gaming and desktop apps. If you're looking for a gaming comp, C2D is the way to go, or the Xeon 3xxx series if you want to overclock slightly more (and keep the Xeon name), they're both LGA 775.
Explain your situation a little more, and I can give you a better answer.