Just curious, which processor are you going to replace the 861v8 with, for conducting multichannel music playback you will need an AV processor, right? Trinnov?
None. The 861/HD621 has been in an audio-only music system for years. I can listen to discs via the analog outputs of my Oppo player but, generally, I rip my discs and store the files on my NAS. My HT is located elsewhere.
P.S.: I do not doubt that there will be a Meridian 861 solution for AV/HT but it is not clear that it will have the open support for multichannel file playback that I have now. The 861/HD621 have been out of my playback system for more than a year.