I need to get a new cpu for my PC and I want to get either a Phenom II X4 955 or a Athlon II X3 450 or a Athlon II X4 640. Which one would be best? I will also be getting a GTX 660 or a 7850 in the near future with 16gb ram and I'm not getting Intel cause I just got a new AMD board. I do mostly gaming with a little converting,coding and multitasking.