It all depends on what your preferences are. I personally went with the non-MOE version but made sure i got the threaded barrel. The MOE version comes with some great add ons...Magpul grip, stock, etc. I just wanted mine to look a bit more unique so i went with the more standard option and upgraded the stock, grip and optics separately to my specific tastes.
However, i would say the Magpul flip up sights that come on the MOE version are far better than the normal A2 sights and are definitely worth the extra cost of the gun. You really can't go wrong with either option.
Good luck!