with a 1300 hundred dollar budget i would consider the i7 3770k on a nice z77 board made by asus or asrock (asus sabertooth is pricey but apparently it's amazing), a radeon HD 7850 is the best bang for your buck, or a GTX 580 around the same price, those will run almost any game on high at a good frame rate. I wouldn't go for more than 8 GB ram unless you can get a good deal on a 12 GB or 16 GB, get a SSD for your boot drive and like 2 TB for your data drives. Look for combos on NewEgg and you can get that stuff for like 1000-1100 bucks and get yourself a nice monitor, mouse, case and keyboard =)