Asus P5Q Pro if you got the budget:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131299On the cheaper side, i would consider the GA-EP43-DS3L and then add 4GB PC6400 which is as low as $40,- for 4GB of OCZ brand (2x2GB)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128347R&Tpk=GA-EP43-DS3LAdd as much memory as you can afford, it's almost free these days and the market will dry up on DDR-II as DDR-III is being phased in.