I am looking for an AV receiver for a gift to my dad and have narrowed the choice to the Denon AVR1603 and Yamaha RXV530. (He does not care if receiver is 5.1 or 6.1) I cannot listen to these units side by side with the same speaker setup. I am planning to get the Wharfedale Diamond 8 series, found the music acceptable. These three items are carried by different stores here in the Philippines. Anybody has any comment on using the Diamond 8 series and the Denon AVR1603 or Yamaha RXV530?