No point of getting the 3820 over the 2600k. First, I would suggest getting a better power supply and much better cooling. I seriously recommend you go custom liquid cooling on the FX-8150 because they OC like wolfdales (if you know what i mean
) You should be able to get a high overclock easily and you will notice a much better performance boost. As for the extra money, spend it on another 6970 for crossfire.