Hey there I am looking towards getting a new PC (I have a laptop at the moment but the thing lags out super easy). I am mainly going to be using it for gaming (Diablo 3, WoW, League) & for videos effects (so decent rendering is something I am looking for). I am wanting to build to build with NCIX because they are local and will do a build for $50.
Your big friend in that build is going to be your video card, I can't say good or bad about theRadeon you selected, I will say I have had great results with my current NVIDIA GeForce GTX 660 card. Personally I wouldn't worry about the OS, if you arecomfortable with Windows 7 stick with it, the performance is just fine.