If it has to be SLI capable and DDR2 ram you don't have a lot of options... XFX and EVGA also make 780i boards, and then there's the MSI board:
http://www.cbcnz.com/images/134769-cbcnz.JPG
What's so terrible about your current Asus 780i if I may ask?
Mine's perfectly stable, video issue is gone with 1401 bios too....