huilun02 :
Get the 770 then. SLI has less issues than Crossfire. Just make sure your motherboard allows you to SLI
So long as you SLI sooner than later, then ya 770 is the way to go.
Problem is by the time most want to SLI it is usually better to sell the old card and get a new one based on new tech. It is just better to run one card than two. There is less that could go wrong and games are a moving target. With 4k coming around GPU ram becomes something to think about as well.
Your mobo link states that you can SLI/CF. I wish we had more information about Mantel. I am interested in how AMD CPU/GPU rigs will fair vs rigs that mix AMD/Intel/Nvid.