I know the HTR 5660 is a clone of the RXV 640. I was going with the RXV model but my local shop says they will only get the 640 to sell when they sell all of ther 630's (who knows how long). The HTR 5660 is readily available at Best buy and I noticed it has preouts for all chanels which was the only thing that really set the HTR series apart from the RXV series. Does the RXV series really have that much more QC control than the HTR? I am sick of waiting for the RXV series to show up in my area.