Hi Braidy,
No problem, I'm here to help.

If you haven't bought the MS200 yet, it may be worth considering the new 218 zone controller. This will allow you to gain access to MQA files too.

In terms of processors, these should have an optical/digital input so that you can output digital audio from your blu-ray player without the need to convert to analogue and then back to digital again. All of the below processors are legacy versions which will connect directly to the speakers you're looking at. The MS200/218 would output via the digital outputs into the processor.

Ones to consider would be:

568.2mm - 500 series with MHR input to accept high resolution audio from an HD621. Still well regarded by forum members

G61 - G series replacement for 568.2mm

G68 - has video switching (may not be required). There are quite a few versions of this, you need one with DSP outputs

G61R - adds room correction to the G61. With your minimalist room, this would be a useful feature to have.

C61R - a rare rack mount version of the G61R. This would be good for your cupboard installation but not so pretty in the room as it's designed to be rack mounted.

Hopefully, this helps.
Peter

Clever & Simple
Meridian Dealer In South West London
for my personal account please see PeterRW