I wonder what the difference between these lines are...in particular the HTR-5560 and the RX-V630. Is it a fair comparison to say the HTR is Sony DE equivalent while the RV-X is Sony ES equivalent? Should I expect much higher build quality from the RV-X line? Lastly, can anybody comment on the sound of the Yammies vs H/K, Onkyo, and Denon? Thanks in advance.