I had a Meridian G-68; and upgraded to a used 861 v4.2; and use the Sony 5000es Blue ray player. The blue ray handles the new codecs with internal dacs; and I use the analog out of the BD into the Meridian processor...most of my BD discs however are still DD 5.1; and not the HD audio...the G-68 is already configured for 8 channel analog in; and is a good processor; with the benefit of a zone 2 control, and easier use and programming. The 861 is a bit more musical on my music server; but using it for zone 2 was more challenging. A high end store where I live is using the G-68 as its processor on a full Meridian speaker line up; with a great projector and blue ray; and it sounds fabulous...
Don't know much about the Meridian HDMI converter switcher which is now out for around $2800; it splits the audio and video from hdmi signals; as the processors don't handle hdmi.
Much depends on your budget; and if this is only used for HT; or combined HT and audio enjoyment...cant' go wrong; good luck