Sub $1k Power Amp to pair with Bryston B-60

Looking for advice on a couple of questions.

The scene:
I have a B-60 amp that I love the sound of (perhaps a bit dry, but all round great). I have it running a pair of B&W685s that I would one day like to upgrade (not for a year or two). I am moving into a new house where I will have a dedicated room, and would like to run a bit more power into the speakers (60 WPC works, but the speakers only open up at about 50% on the volume/power knob, at which point the bass can start to get a bit muddy quickly).

My first question:
By adding a power amp to my system, will I get more detail at a lower volume/power levels?

The second question (if the answer is yes to the first):
What would be a good power amp in the $1K range for this set up? I am fine with used gear, and would probably be looking at the 150 WPC range (to allow for future speaker upgrades).

I listen to anything and everything. Classical, rock, jazz, soul, big band, reggae.

Any help would be great.

Thanks!