805n B&W speakers. What to pair them best with?

I have the Nautilus SCM1’s which are very close to the 805’s you have.
Best results here is the Bryston B-135 with them.

Now keep in mind, I have always preferred and owned many B&W’s, 704’s, 703’s, 803’s blah blah blah
Recently went with the newer 704 S2’s which paired up nicely with the B-135 but I did purchase them for the Simaudio Moon i3 SE which is where they are now.

So, back to your question. The SCM1’s come alive with the B-135 in comparison to the i3. The 704’s preferred the i3, the B-135 was just a lil too much amp for the 704 S2’s and my comfort zone. I hate replacing tweeters, much less crossovers...laffs
My thoughts, the more sensitivity the more power you need to drive a speaker to appreciate them.

@mckmxcv Silly as this sounds I want them on my desk on either side of my pc about 5ft apart. Yes I know that’s not ideal. However I tried them in my main system first with Bryston 7B st amps 600watts per block and my direct stream ps audio dac also being used as a Preamp. I know they can’t compare to my much bigger 802 towers but I was expecting them to be a little more revealing and not as muddy as they ended up sounding. I ended up popping them on my desk anyway and hooked them up to my 250watt per channel Yamaha and the sound is about the same not that I expected much from the Yamaha either. 
@ mental Thanks for the tips I’ll check out that Bryston 135

I would say that feeding it a full-range signal is contributing to it sounding muddy; if you can, try add a crossover at maybe 40Hz (regular or digital, or even EQ down the bass via your computer), and that may help tighten it up. 
 
For a desk, make sure to get some isolation pads/stands, as bass vibrations going thru the desk/table will also cause it to sound muddy.