2. Example at http://www.pcworld.com/article/2040319/build-the-ultimate-intel-haswell-pc-for-under-1000.html
3. Re-use what you have to a point.
This is my first time building a PC and any help would be much appreciated. I have about 800 dollars to spend and need all parts. The computer is mainly going to be used for gaming and I would appreciate any and all advice about anything gaming/pc related. I.e. what parts I need in general, what parts would be better for gaming and what parts are the best value.