Suggestions for New/Used amp under $3500

Interesting price range to be looking in. It will also be interesting if you can do better than the CIA amps. I hope you can keep us posted on how things work out. I've always wonder how amps like the Odyssey or Emotiva would sound. I had the VS VR4SR speakers for some time with a set of the Parasound JC-1 amps and it was a very good sounding combo. I would even think you could throw Krell or Pass amps into the mix. Or the Sanders Magtech or how about the Spectron Musician III mk 2? Or Bel Canto Ref 1000 mkII (since you already know class D can sound good with the CIA amps) If I were in your shoes I would try first to get an amp with more power than the CIA just to see how the speakers and room and all respond to something with more power. Usually the more power the better only problem is the cost of more power. If you cold stand the heat I'd try and grab a Pass 250 or 350 or even Krell 400 (might be a touch over budget but they hold their value)

There is a Pass Labs X250.5 that would blow away anything you are considering.

I have a Butler TDB-5150 that replaced a Rotel RMB1095. Pre and Pro are Emotiva USP-1 and UMC-1. Speakers are Salk HT1TL's. The Butler brought my system to an entirely new level. Soundstage depth, air around instruments, instrument decay all improved to jaw dropping levels. Frankly I'm surprised that this amp does not get more press. Huge upgrade versus the Rotel.

Call Klaus at Odyssey. You may be presently surprised.

Based on online reviews, posts and personal suggestions, the following is my assessment of audio quality (not considering other factors like price, weight, size, heat, power consumption etc)

Emotiva < Odyssey < Butler < ci audio

Not sure where parasound fits in that ordering.

The Pass Labs X250.5 may be much better but does not appear to be within budget... even in the used market.