First Computer Build, Need help.?

Let me help you here now:

CPU: you're going for games, so your CPU is less important. CPU's are used for multitasking and a game is just 1 process so you don't need a real super duper CPU for games. I5 3th gen will do just fine.

About the heat sink, not needed because the heat sink designed for you're processor is delivered with your processor.

i edited your pc configuration a bit and i lowered it towards $841.08

Here is the link: http://pcpartpicker.com/p/1edCZ

I changed the I5 to a cheaper one with almost the same specs and i deleted the heat sink since you don't need one.

Also i noticed that you don't have any network adapters configurated. If you want to do something on the net you need one (wired or wireless). This will raise the price though... I didn't add it to my configuration so you can figure it out.

- If you don't care about the latest hardware, use 3rd gen. Will be cheaper and will still be able to play games that you've mentioned on high settings

- Nope unless you experience overheating

- You could downgrade to something like 450W if budget is your real problem, but bare in mind that high end PSU could be useful later on when you want to add more parts to your computer

Also if you're building this for gaming, downgrade to Core i3 3rd gen (3220) and go for 660 graphics card, as GPU is more important than CPU in gaming

Have fun building your own computer!