Moon i1 I.5 220i 250i 240i 330A differences?

In the last 2 weeks I’ve demo’d the SimAudio 340iDPX driving my Harbeth M30.1’s & the Hegel H590 driving Harbeth M40.2’s & would recommend the Hegel for warmish speakers..I think Pure Class A & a warm speaker will sound a lot like the old Conrad Johnson tube stuff,a bit too sugary.The Hegel also had better headphone performance...

Yes, consider a Hegel integrated.

I just replaced my Vincent SV-237 with a Simaudio 600i.  I was disappointed when I first heard the 600i because it lacked some of those qualities you describe, which the Vincent has in spades.  Except for maybe the "bright" part.  I wouldn't call it that, but there is a lot of energy in the upper mids and treble and it's very responsive to tube rolling. 

After some extended listening, I do like the 600i better, it's more refined, easier to listen to, and a little more detailed.  Speakers are Harbeth P3ESR. 

Jump on a used Vincent if you can find one.  First 10 watts are Class A, 150 watts at 8 ohms, 250 at 4 ohms, and a tubed preamp.