If you didn't need two high speed PCIe ports, then you could really reduce costs. Running SLI the "best" budget options are that ASROCK or the two Gigabyte boards below. There may be options with Biostar, MSI, etc, but I typically stick with ASUS, Gigabyte or ASROCK (and in that order). I wouldn't consider related ASUS motherboards budget boards...
Gigabyte Z68 => http://www.newegg.com/Product/Product.aspx?Item=N82E16813128512
Gigabyte P67 => http://www.newegg.ca/Product/Product.aspx?Item=N82E16813128488