Ok folks heres the deal: I have a Aguilar GS112 which sounds great, but I have been playing with a moderatly loud rock back for a little while now and the cab alone is not quite cutting it any more. I am upgrading my amp to a 700 watt poweramp(QSC) and eventually a sansamp RBI. What I want to know is your opions on what would be a good cab to add(or replace). For now I am going to put a ball park number of about $400 new or used. I have been looking at either a Avatar 4X10, Bag End S15-D, or another Aguilar 112. Which of these do you think would be the best sounding/loudest combination, or what other cabs do you think would work well for me at my modest budget?