I was recently trying to build a gaming PC, but gave up because I found out I have no clue what I am doing. So instead of building one I would like to buy one already built that is strictly made for gaming. Preferably running windows 8 and can run games like BF4 and future games to come on high and ultra. I am not sure what to look for so if anyone has any ideas on a good gaming PC I would love to know what I could buy for $600-$1100. Also replaceable components or expansions would be a great option too.