For musicality you have another option that I think is better. Buy an integrated 2 channel amp (almost always better than an AV reciever) that has pre in. keep your current AV amp for watching movies.
Run a preamp out signal from your AV amp to the Pre-in input on your 2 channel amp. When listening to music the AV amp isn't even turned on. When watching a movie, run both amps with your 2 channel amp on Prep-in. Pre in is also called direct or ht-bypass. --Jerry