I can't give you a comparative description of the different 2-channel amps you've listed. However, I can tell you I have the Cambridge A500 and P500 bi-amping a pair of M60's, and it sounds fantastic. I purchased and set-up this system in our living room specifically for music (we are going to purchase/set-up a HT system in our Rec Room in several years time). If you are considering a 2 channel system, you can't go wrong with Cambridge Audio components...lots of bang for the buck!