First of all Behringer is known for its not-quality of products. Above all the iNuke series. I haven't tryed the EP4000, but my advice is don't buy behringer, it isn't reliability.
If you haven't a lof of money, the best solution for you is the TA2400, it is very good in quality and price.
In fact now I was looking for the behringer NU6000 mostly because of the DSP..
Do you think I will need DSP? I hear that TA2400 is good but doesn't offer to many options.. at least I think a crossover? these TA's dont have at least a basic crossover...