sigh.....
I reckon best budget for money is a plain ol' socket 1156 mobo with the i5 750. Given that I don't think SLI is a good idea, I don't know which motherboards are best.
However, I do know having SLI at x16/x16 isn't much different to having SLI at x16/x8, so don't make x16/x16 motherboards a priority. Doubt there are any to choose from with a socket 1156 anyway.
Also, Intel socket 1366 motherboards tend to be much pricier, and take only i7 CPUs. People who go the SLI route tend to go for these, only because they are more interested in bench numbers than their wallets IMO. If you can tell the framerate difference without FRAPS, you've got bionic eyes.
Or of course, you can go dual socket 1366 Xeons as pictured by dividebyzero, who is proving a very important point about STATING UR BUDGET.