My quick response on sound of various brands listed:
Oppo 105/105D - really clear upper registers, good spatial representation, decent bass
Arcam - bit warmer mids, voices. Good treble extension and bass, but maybe not the nth degree of sparkle and spatial info (except CD37 which is boardering on high end sound - for two channel probably the best of all listed.)
Cambridge - in between Oppo and Arcam, but closer to Oppo (because they might have the same essential guts but Cambridge voiced a little differently, it’s British!).
Denon - probably haven’t heard one of these in over ten years, no insights here.
The Oppo would be a good choice. Buying used you could try it and resell without great loss if not your cup of tea. Could also repurpose as kick butt Bluray player if you wanted.