Check your link. I'm only seeing a cpu and a cooler.
I made some edits, heres the new link http://pcpartpicker.com/p/3cnKd
1. A 4670k and a 780 will blow away any game at full ultra with the exception of using very high res (2440x 1440 or something)
Don't know why you're paying 140 bucks for an OS. Here's the exact same thing from newegg at 100 bucks.
I actually have a surface pro 2 for non gaming (school) stuff. I really like it and the os, which is win8.1 64 bit pro. Idk if there is a difference between pro and non pro (let me know if there is), but I at least need 64 bit bcuz minecraft recommends a 64 bit for maxing out render dist.
Definitely choose 64-bit if you have more than 4GB of RAM, most upcoming modern games recommend you to choose 64-bit OS anyway(Watchdogs, Titanfall, and maybe GTA V).