OP,
Correct, ARC stopped making CD9SE’s because their supplier stopped making the transport. I am sure they have lots for repairs. But these days transports tend to be pretty reliable. They used to be terrible.
While I do not know this, I suspect ARC will not invest in producing another CD player… it is a market that is contracting quickly.
MacIntosh and Audio Research are on very different sides of the sound spectrums. Mac typically lacks detail compared with Audio Research. Their house sounds are very different.