Moon i3.3 vs Plinius 9100

What I would recommend that you try to get your hands on some demos from a dealer. This may seem like very out of the way now, but down the road you will be thankful. Like I said, I have never heard simaudio with dynaudio only plinius. All we can do is try to describe the sound, but it boils down to preference with these brands since both have history of being matched with your speakers.

Either one. Both good picks for Dynaudio.

Thanks!

Is it i3.3 and 9100 in the same category with Dyns Excite (ex Audition) series or maybe I should look at something like Sim i-1 or Naim XS.

I would consider a used Moon I-3se to match with the Excite. The new I3.3 is a bit too pricey for those speakers IMO. If the I-3se is not to your taste you can easily resell it and recoup your money.