The most musical fidelit amplifiers has a pass through that's the best option. Intergrated with the Denon 3700.
surround processor?
Where to go? Older Lyngdorf MP50, JBL SDP-55,Arcam AV40.Lexicon MC ( the cheapest)? Love to watch the movies but also listened to 2 channel stereo. Are there a big sound difference in those? Just the general advice please. Will probably look into second hand.