(Beware: DN = Digitone / DT = Digitakt)
What’s the part you particularly liked in MM?
For FM, Digitone is IMO way better, but it has its tone, I found.
Playing with it is quicker than on MM, I found.
It doesn’t feel limited to me, if you take it for what it’s good at.
Some users can push it hard:
Now if what you like in MM is the modularity, the weird behavior of filters pushed to their limit, waveform and whatever makes the MM rather unique, well all I’ll say is 2k€ is quite some money on an old synth, but yours to see.