If you want to play the latest and greatest at full speed, the rule is always the same. Buy the best processor available and overclock it as far as you can. At that point, you will be able to at least boot most if not all of the most recent games. I don't even keep up with CPU's any more because they advance so quickly and cost so much. I think you are currently looking at an i7 quad core overclocked somewhere north of 4GHz.