dude S.A.W is like a serious steroid! I would be very careful using it. It will make you gain muscle and also loose fat at a really fast rate. Just dont forget to eat a lot and have your pct lined up.
When I built my rig for BF3 I chose a 965 over i3 because of its 4 cores. If you end up choosing a phenom make sure to get an after-market cooler because the stock ones are loud as hell.