I'm going to crossfire in a few months when I get more money... But I'm not to good at seeing if I have the right connecters. I also have 5 case fans that come with my case and I don't know in they will be able to connect to my MOBO
You'll have enough power for Crossfire for sure (with the 750W unit and especially with 2 7770's). I'm not sure about the case fans. If they have 3 or 4 pin connectors to connect to the mobo, you may need a "Y" splitter or two, but if they have Molex connectors, you can just connect them to the PSU.