The Rotel RB-1590 is a great amp and bang for your buck (relatively).;-) It would be fantastic with your B&W
It was a crapload of money for me but I love mine. It works great with my B&Ws. A used one would be in your budget and a new would be close with a bit of a discount from a good dealer. Good luck with your search.
https://rotel.com/product/rb-1590
Cheers,
Scott