I'm about to endeavor into building PC's but I have no clue what parts to include. I have people willing to help me put it together, but I have to order the parts on my own. The main use of the PC will be gaming while chatting with friends, I play many different styles of games (BF4, WoW, WoT, etc.). My budget is $700-$850. I will need this price to include OS, but I already have a keyboard and mouse, and I will be using my 39" 1080p 120Hz TV as a monitor.