1- BE: Black Edition, means, unlock multiplier. This processors are specially for Overclokers. Easy overclock, like my 955 BE, just with rise the multiplier can get the 3.6GHz.
2- Not BE: Lock multiplier, more dificult rise the frecuency. For people that use her PC at stock frecuency and never think in OC.
Now, the question is. Are you in the firts group? or the second group. If you want learn how OC your PC an CPU, buy the BE edition, but if you think all the games at stock speed don't buy the BE.