Which integrated for Wilson Sabrina's

You apparently are seeking some kind of validation for your equipment. It’s fine. I get it.

@panzrwagn where did that come from? I don’t need anyone to validate my system.

Also, a pair of used XA60.8 are within the OP’s budget and there’s already a fine preamp there in the system.
 

But the current Pass Labs offerings, irrespective of quality, offer no solution in this case.

The above statement couldn’t possibly be further from the truth.
Class A amplification, and Pass Labs in particular, checks all of the boxes for the sound qualities OP is seeking. May be I missed the requirement for the phono stage and a DAC? But the solution I provided kicks the ML integrated down a flight of stairs.

@cshadow 

And if you are set on an integrated, once again, Pass Int250 will be close to what you are looking for sound wise and will provide plenty of power and control. Used can be had in your price range. Another excellent choice would be a used Luxman 595 Class A integrated that you can find now for under $10k but again if you have a very large room and looking for concert levels it might not be the right choice. 
Gryphon and D’Agostino are unlikely to be found in your price range used but you can stumble upon a Gryphon without the DAC module in or around your price range if you wait. 

+1 on Krell.  Read the stereophile review by Jason Serinus.  I heard that set up on his system, and it was very impressive.

I realize this Vitus integrated is more than your desired price, but it’s about half its list price and may be a bit negotiable and should deliver just what you’re looking for. 
https://www.audiogon.com/listings/lisai451-vitus-audio-sia-025-receivers
I also heard BAT with an older pair of Watt Puppy 8s (I think) at a show it it also sounded really good, but that was obviously a long time ago but always left me with a feeling there was some good chemistry there.  Best of luck. 

Tweeters on the older Wilson models and on the Sabrinas are very different.
The W/P 8s that date back to mid/late 2000s used inverted titanium tweeter. Hotter sounding than the silk dome tweeter Wilson Audio implemented on the Sabrinas. With BAT you may end up taming a bit more than you intended.

Ultimately, home audition is a must. And unless it is possible or a decent return policy is in place, go used. You don’t want to drop this kind of dough blind buying a new component, end up not liking it and getting hosed on a resale.