Asus Maximus VII Hero with 4790k, CM Hyper 212 Evo with dual fans, CM HAF 932 case, Corsair Dominator, PNY 780 ti, intel 520 ssd, Enermax Platimax 1350 watt, Windows 8.1 Professional x64 with Classic Shell
Side note: if you want the AC3 game with your 840 pro, you can only get that offer through specific retailers. Newegg is probably the best bet.
I went with amazon. I want the game because "for a limited time" which seems to be now it was widely reported that the drive has the game as a bonus. I have no idea how to play that game and as stated previously I'd rather have Macrium pro or something included that makes the transition easier or better yet lower prices.