I would take the 7700 as it sounds like it is in another league from the 2200 amp. It is also much more convienient to plug in one power cord as opposed to 7. It would also take up less space. I have heard people complain about the power of 2200s with 4 Ohm loads or at/near reference levels. I have never heard any complaints like these from prople about the 755/7500 770/7700 amps.