So I am getting a little bit of money to upgrade my computer. I'm happy with all of it, except the processor. I've decided on either a Phenom II X2 550, or an Athlon II X4 620. I don't have ACC so not unlocking the 2 cores of the 550 or the L3 of the 620. These are my two choices, and possibly a proven processor, the Phenom II X3 720. Which would you choose out of the 2 first ones? Would you get the 620 over the 720?