Integrated Tube Amp approx. $2,500

The Willsenton R8 with tube upgrade would fit within your budget. Ordered via Amazon, you would have their return policy benefit. That amp will deliver 45W per channel at 8R, and the performance is very good. You might be able to find a used Prima Luna in your price range with a little looking around. Other options might be a used Audio Research i/50 or Margules i240, both of which would be excellent choices but would cost you another $1500 or so.

Another vote for the Muzishare X7. I have had mine about a year...was blown away and didnt expect the sound I received. Rolled a few tubes...even better. The never satisfied person that I am....I wanted more..so I found a local tech that does mostly mac's and highend tube repairs..asked about doing a cap upgrade ....which he did...upon opening up...he was very impressed with the build quality.

the Vincent Audio SV237 hybrid

Rogue Audio Cronus Magnum can be had used in your price range. 

Do you really need an integrated?  Many people don't. I use my DAC as my pre and VC when I don't have my Transformer VC.  I do have 2 inputs to my amp so I can also use it with HT.  

If you don't really need an integrated, a simple point to point amp like the $1200 Decware SE84UFO will blow away any of the other amps you are looking at and is plenty of power for those horns.

Aric and Apollo also make great amps.

Jerry