I am looking to purchase a new receiver. I am more concerned about sound quality than about overall power. Right now, I have the Onkyo 500 speaker set. Thus, I will have to add another rear speaker to take advantage of the Onkyo 600. I have tried both of these receivers out at CC. The sales person there was pushing the H/K. I also have read several reviews on each system, all of which have been pretty good. I am looking for some input to help me make the decision. Of course, pricing is a factor to consider. However, looking at various retailers, there seems to be only a $50 difference between the two sets.
From my observations of the two, I'd go for the Onkyo. Overall better build quality. Sounds more full to my ears too. To each his own though.