6 months ago you had some choices,but now the supply of LGA775 boards using DDR2 has about dried up. A Gigabyte GA-EP45-UD3P meets all of your requirements except availability. And I will not sell you mine.
Came up dry on newegg, amazon, TigerDirect, and Frye's.
I see two alternatives:
Upgrade to a newer platform, keeping the video cards and selling the CPU and RAM.
Look for a used board on eBay.
I might be able to find you one downtown - downtown Dhahran, Saudi Arabia but shipping will be very expensive.