There is no doubt the FX 8350 is the best AMD has to offer.
All the MOBOs that comes with it can be overclocked. They all support SLI and CF. I would just pick the cheapest, I don't see why you should spend more money on something that won't really affect your performance by that much. There might be a difference of how well the different MOBOs overclock, but I wouldn't care too much about that, the difference isn't spectacular.