I think as long as you wire with shielded structured cabling (STP CAT5e or better) then you will cover yourself for many applications. You could for instance get a single MC600 for each location and initially flood wire for speakerlink (or legacy 'reviver' / AC12 converters) for DSP speakers and IP networked connection for an optional ID40 card in your 861v6 for optimal audio performance.

If you don't go for an MC600, you can still choose other options, but if you get the cabling right in the first place, that will not change.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).