Hello, I currently have a Harmon Kardon AV-630 receiver and Axiom home theater speakers.

M60 floor R/L
VP 150 ctr
Qs8 surrounds
HSU Sub STF2

I was thinking of upgrading my receiver to have some of the features new receivers offer but I don't want the sound quality to suffer. Can you recommend any receivers that would be comparable sound quality wise. I would only be using 5.1 as it seems to do the job quite well in the 12x24 room. Any suggestions would be helpful. I have not paid much attention to the audio world since I bought this setup seven years ago or so. Many of the new receivers seem much cheaper and quite a bit lighter. That HK weighs over 40lbs I think! Am i wrong to associate weight with a more powerful power supply and likely better quality?