Personally I prefer the 650D, purely down to its appearance. However the Sniper has more features and as said above, has the nice fan controller option. The case is also very wide, so more than enough room to fit that Hyper 212 EVO CPU Cooler in there
And no certainly not the Extreme7 for a $1000 build. The Extreme4 GEN3 would be more than adequate for an SLI set up. (It runs x8/x8).