I don't think the upgrade from the rvx1400 to 2400 will be worth it to you. The only real difference is a nominal power increase, and like 2 extra dsp (the 1400 already has like 27) modes and 2 inputs. If you go to etronics, you can bring up a comparison chart. I could be wrong, but I think that's about it. Someone else may have a different opinion. I think the 1400 should have pretty much everthing you need, and the extra money could go toward other setup and calibration costs, a sub, stands...
you get the point.