Dynaudio C2 with Plinius 9200

I think Plinius 9200 will drive these speakers purely from power perspective. Not optimally, but it will. I would not worry about that from the get-go. But in a long run, you should know that Dynaudio speakers like power.

Does Plinius mate well with Dynaudio sonically?
That is a different story. If we are talking integrated amps, I would rather pair the Dyns with a Krell integrated than with the Plinius. I think Krell amps are a good match with Dynaudio. Dyns are one of the few speakers with which I would most likely not hesitate to use the Krell amplification. But that's just me. Or a new Pass Labs integrated amp, the INT-150, I think would mapir nicely with the Dyns, but may be a bit on a smooth, relaxed side as well.

Anyway, if you like and want to C2s, go for it. You can always try a different amp with them at a later point. The most important thing you should decide is whether or not Dynaudio C2 is the speaker you like and want. That would be more important than worying about an amp. You should buy amp for the speakers. Not speakers for the amp.

separates usually perform better than integrated amps.
this is where the upgrade in sonics would come from, by switching to separates. but in case of speakers that like power, the overall improvement would be questionable at best, since you will be switching to a lower powered amp. I would start with 200w/ch into 8ohms for these speakers.