You're looking to crossfire the GPU's? If you can't stretch your budget a bit more and get the GTX650ti then get the HD7770. The core edition also comes with 2x fans with ghost thermal technology which allow for better heat displacement and not to mention the card itself looks cool as hell. If you're wanting to crossfire them don't bother. Just get a single card solution such as the HD7870LE
Crossfiring two entry level cards is simply no point. I would invest in a 660 atleast, 650ti is fairly weak, and won't perform very well in games at 1080p. I would personally go with the 760 as it's dirty cheap right now. You can pick it up for $249.99 right now.
The GTX650 Ti is an excellent card for 1080p provided you don't insist on turning up all your settings to max. Most games should run fine medium-high, with lower settings for the most demanding games like Crysis 3 (which can run perfectly smoothly on the Ti at 1080p and AA with reduced settings).
Consider yourself pardoned. Nice CPU there! Just follow the instructions in the motherboard manual (or Youtube) and you'll be fine. No need to force anything - just sit the CPU in the socket and close it, then attach the heatsink. I don't do IM, social networking etc but post back if there's something specific you're unsure about.