Best Budget Integrated Hands down

I'd add the Densen B-100 to that list. Unfortunately I think there's only one shop in New York that carries them in the US.

I'm quite happy with my Bryston B60 integrated, however, if I were to "trade up", I would probably either consider the Creek 5350SE or the Plinius 8150...I think that it also depends on what speakers you plan on driving...I am using B&W CDM1nt's and am happy...who knows...after 2+ years of having the Bryston, I may find that I am accustomed to the sound and find that the conditioning will affect my preference and I may not like the "upgrade"

just my 2c

Ellery

I've auditioned several in your price range. Ended up with the Plinius 8100. You can probably find a good deal now that the 9x00 line is out.

Might want to add the Simaudio i-3 to your list. It's about a thou used and is a solid product.

Are there any features you're particularly interested in? Phono, HT bypass, etc could make your decision easier.

quality comes in price brackets...within each price bracket you trade off pros/cons but dont expect to find something under 1000$ that will beat something for 2000$
(used pricing at least...some companies will put any-ol number up there for retail/list price!)

I have listened to the Bryston, the Audio Analogue, and the Audio Refinement Complete in my system at one time or another. All are decent enough amps. The Plinius and Classe are very good but kinda in opposite directions.
Of the 3 above I have actually lived with, I will go with the other one I used, the Creek 5350se. It just sounds more refined. The only caveat is it comes with a passive preamp with increased gain in the power amp section. Source components need to be matched somewhat for voltage compatibility. Unless it is a really low voltage source, everything is fine. You can also purchase a gain board for the amp that allows for about 7db more gain but I think it detracts from the pristine sound and imparts a little coloration. The Creek was a Stereophile "Class A" component, a status it deserves IMO.
Going to have to do your homework. All are pretty good little amps.