From what I've read lately, sounds like the Asus P5W-DH Deluxe and the eVGA 680i SLi are the best boards for it if you plan on overclocking. If not, almost any 965 board would be good I think. Maybe a P5B or a DS3. This might help: http://www.anandtech.com/mb/showdoc.aspx?i=2914&p=4
The best board for around 100 bucks is the Biostar 965PT. After that the DS3 around 135 is an excellent choice. Then The P5B-E around 150, up to the P5B Deluxe at around 180.