Well, there is not too much to say, if you want to learn more about Phenom processors, read my review on Phenom 9500.
Intel is still best in quad core market, but if you want AMD processor, AMD Phenom 9600 Black Edition is definatelly your choice.
The price is about 220$, it is almost the same as 9600 (which has locked multipliers).
So get 9600 Black Edition, especially if you are overclocker!