Was thinking of getting some Crucial 4GB (2x2GB) DDR3 1333MHz/PC3-10600 Memory Kit CL9 1.5V, do you know if it will be ok for overclocking?
I highly doubt you'll get any more from a CAS9 kit rated at 1333.
Your best bet is buy 4x2gb ddr3 1600,it will survive a few upgrades and will allow you to run the Phenom 2 at a higher bus speed.
Plenty of threads in the memory section of these forums with what others have chosen and some recommendations.