I am considering purchasing a used 5 CH amp in the 125 W per ch range. My current set up is Paridigm Monitor 7s, CC 370, Mini Monitor and Pw2200 powered by Rotel RSX 1055 PW 2200 Sub. Room is about 2000 cubic feet but opens up onto stairs up to the kitchen. Probaly 70% HT 30% music. Here are the options: 1. Run all 5 speakers off the amp and use 1055 only as Per/Pro 2. Run all 5 speakers off of amp PLUS Bi Amp Monitor 7s using the RSX 1055 (I think this is possiblle but notr 100% sure) 3. Biam Monitor 7s using total of 4 CH off of the amp and use 1 125 W ch for the center and allow the 1055 to run the surrounds. Which would give me best performance and sound?