$1,500 Amp budget - Best options?

I have narrowed my speaker search down to a set of B&W 803S or 803D.

Question. What are the best options to power these speakers with amp budget of around $1500? I'll be using my Marantz 5006 as the pre. Yes, I know there are some more expensive options that may offer a bit more quality, but this is what it is and I'm sticking to it. After I get my options, I'll try to audition as much as possible.

So far I'm considering a new Emotiva XPA-2 or used Bryston 4B-ST. What else do you'all think I should be looking at?

Thanks!