Alternative Audio in Canada has a used YBA Integre with the optional phono stage for $1250 Canadian dollars, which is about US$800 plus shipping. They do ship to the states. This amp will match well with the B&Ws. Their used link is:
Just so you know why I am confident they match well: The small system in my home office which is playing chamber/classical while I type this; is the DT version of the YBA Integre powering the original B&W CDM-1. I almost prefer this small system over my larger one downstairs.
The YBA Integre DT (dual transformer) is a top rated Stereophile integrated (Class A). The non DT version for sale used at Alternative Audio is very close behind. The CDMs are not hard to drive, so you should do fine without the dual transformer version.