Considering a new amp for my Vandersteen Quatro CT

Spending thousands on another amp is a waste of money. The Bryston is an excellent and reliable amp. You will only be fooling yourself to think that a newer amp will somehow sound better and more "musical". 

Interesting comment but I do not have the same opinion.  We manufacturer audio products and repair audio products plus live in the NYC area where we have heard and have access to more audio components than most people have ever heard.

That being said, the Ayre is a good choice, and you should also consider the Asthetix hybrids.  Depending on where you are located and what your budget is, I use our Class A tube amp on my Vandersteen 5As which so far provides the best sonics I have heard on the 5As.  Since we repair so many amps, I get to hear what they sound like so you can say that I am biased but it is not only my opinion as many people have heard the sound.  You do not need that many watts as you might think to drive your speakers.  Even the old Counterpoint SA-100 power amps sound good on the Vandersteens for cheap plus they can be upgraded to reference level.

PM me if you want to discuss.

Happy Listening.

+1 for the Coda.  I have the Coda Integrated, the CSiB, which is for all intents and purposes a Model 8 with a built in lines stage.  Same chassis, no VU meters.  I've had mine since January, and extremely pleased with it.  Big step up from the Bryston 3BST / BP20 combo that I had been using the previous 18 years.  I have the v1, and like the Coda 8, the first 18 watts of the v1 are in Class A.  v2 and v3 have more watts in class B, but less in Class A.  So if 150 watts per channel floats your boat, if you get the Coda, that is the way that I'd go in order to get more of that Class A goodness.  Speakers in my case are the notoriously difficult to drive Thiel CS 2.4s.  The Coda drives them effortlessly. 

IME you would be more impressed with a better preamp than changing your amp.

Belles Virtuoso power amp.  Order one from Johnny Rutan.

I also have a pair of the Vandersteen Quatro CT and use the Ayre 5 Twenty-series products (KX-5, QX-5 and VX-5 Twenty’s) and the sound is great. That said, I am looking to upgrade my speakers to possibly the Kento Carbon or Model 7 mkii if or when I find a suitable used pair at a good/great price.

Have you considered the Vandersteen M5-HPA amp? For what it’s worth; While I have not heard them, I was told they sound better than the Ayre amps.  There is a used pair for sale in Colorado.  They're asking $11.9K