Sanity check please...….The upgraditis bug has bit and I'm in the process of upgrading my home theater equipment. The current equipment is McIntosh MHT100 / amp, Pioneer Elite SC-72 / preamp, Panasonic 820 / 4kBDP, Apple 4K/ media player, McIntosh MVP-851 / CD player. I plan to stay in a 5.1 configuration or maybe go up to a 7.1. I will be adding a MC207 to power the speakers. My original plan was to pair this with a Yamaha CX-A5200 or a Marantz AV7705 as the processor. I would prefer to go all McIntosh and in that vane I was thinking I could purchase a used MX-121, run all video connections to the TV (Sony XBR65A8G 4k OLED) and run all audio to the MX-121. A used MX-121 runs about the same as the Yamaha or Marantz and supports DD & DTS. The MX-121 only supports the HDMI 1.4b standard, but I don't see that this will be an issue as all video will be connected directly to the TV and the ARC connection from TV to the processor will be sufficient for my 5.1 config. The only things I give up by going with the MX-121 over the Yamaha or Marantz is using the processor as a HDMI switch and an internal AM/FM tuner. The new equipment would consist of McIntosh MC207, MX-121, MVP-851, Panasonic 820, Apple 4k, future AM/FM external tuner, and the speakers are Dynaudio Audience 82s / 122 / 62s all 4 Ohm. I have no desire, now or in the future, to upgrade to the current immersive sound standards that are being pushed. My thoughts are the MX-121 is going to sound better than the Yamaha or Marantz, and should be able to handle any current audio signal and replay it as DD or DTS 5.1 . Am I missing anything that I should be concerned with? I appreciate any thoughts concerning my planned upgrade......thanks