Help me choose a receiver,Rotel1550, Arcam 400 or

Amp power means NOTHING till its doubled...class A~B is better smoother sounding than D (as noted by those power tweaks) stick with 50...power wont be noticed at a 10w increase but its harsher sound will be.

I did'nt know about the A/B and D amp class difference.
Now that I read about the wattage differences, I understand what you mean, it said that doubling the(watt)power only increases sound by about 3db.
I'm more interested in the 1550 because I prefer a 5.1 system. Reviews on the Arcam avr400 about same price range as the Rotel)are also awsome.
Thanks Chad

Down to 3 receivers,
Rotel 1550, Anthem mrx700 and Arcam 400 or 500.
Thanks