Here is the common opinion
Cirrus logic/crystal: excellent on high frequencies
Wolfson: tight bass, good detail and imaging
Burr brown sigma delta: very good mids, good detail and imaging
Burr. Brown multi bit: very warm mids, tight bass, excellent staging, great detail
Ess sabre: combination of all, excellent bass, a little different on mids(some don't like it)
Mvp871 is a signa delta design. You need to go way back for multibit designs. Ess is cheap and easy to implement. It seems to match or better most dacs.
As I said mx150/151/160 digitizes all incoming analog inputs so no point in going analog. However I doubt the mx accepts dsd over hdmi. Mvp901 will have to convert dsd to pcm. Pcm over hdmi suffers jitter unfortunately. You might want to look into mx-121 or 122 which have true analog pass through( doesn't convert to digital).
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