digital combos, help, EMM labs, MBL, Weiss, Metron

Including gear from dCS your list is very good try to audition and if you go for combos stay in the same brand.
Although I had good experience from Esoteric transports and dCS dacs, but for example Weiss is a lot better with it's own transport than not.

Mostly you should thinking matching with the rest of your system.

it's not a combo!
it's one-box.