If you're keen on SLI, you can go with 780i based motherboards.
eVGA, MSI, ASUS all have offerings. You can opt for XFX, too.
MSI P7N Diamond ($250): http://www.newegg.com/Product/Produc...82E16813130158
ASUS Striker II Formula ($299) :http://www.newegg.com/Product/Produc...82E16813131255
Though do you really need SLI? Aside from Crysis, all other games can be maxed out on a single 9800GTX/8800Ultra at 1920x1200 and lower resolution.