I'm a fan of the ASUS P6X58D motherboards (P6X58D-E & P6X58D Premium) for any i7 build. If your budget is larger, you can step up to the ASUS Rampage III.
The newer EVGA X58 FTW3 looks good but it is designed for SLI (not Crossfire). You want the best of the best, you are looking at the EVGA Classified SR2, with dual socket support.