My listening experience with SimAudio has made me think of them as a neutral amp. if the Dynaudio Confidence 20 sounds good with the SimAudio then I would try it with the much cheaper Benchmark AHB2 stereo amp. The AHB2 monos are not likely needed for the Dynaudio Confidence 20.
This is not a very forgiving amp, so whatever is upstream needs to be good along with the speaker cable. You can get this amp for 2-2.5k used and can easily sell it.
I owned a CODA #8 in the past and that amp can be found for under $5k. If the speaker is not too difficult to drive, then I take the AHB2 over the #8. I own the CODA #16 and like that more than the AHB2.
The SimAudo 860 V2 is getting cleared out but I do not see a big drop in price. I take the AHB2 over the 860 V2 for an easy to drive speaker.