What should I choose??

I appreciate those of you who talked about listening room acoustics.  I think that is the next thing I will do before I replace my existing amp and speakers.
 
"Bryston and B&W would not be a good fit." p05129

Regarding the above comment...I have had this combo for 15 years.  I like my Bryston for its almost unlimited power at 600w per side.  It is a neutral sounding amp with maybe the finest warranty in the world.  I also deliberately chose the BMW 802d's to match the amp.  I listened to many speakers before making my choice. I like the B&W's for the very reason that they are often criticized, that is, being a bit neutral sounding. I agree, they don't seem to have a sound signature of their own, but dutifully reproduce whatever source music recording they are fed.  If the recording is crappy, the speakers don't hide it.  If the recording is exemplary, these speakers will let you know it and sound extraordinary. As a result, my amp/speaker combo has served to guide my listening and my music collection over the years.  There is a lot of poorly recorded music out there and the B&W's don't hide it.
I remember auditioning some Wilsons awhile back and was initially blown away by their, what seemed to be, very "present" sound.  But the more I listened the more I realized that, to me, they had a sound of their own...too bright and strident (only my opinion) and I began to feel tired. If I hadn't taken the time  to listen to them over a good period of time and on several occasions I might have bought them. For the B&W's it was the reverse experience.  On the first few listenings they did sound controlled and conservative and I was somewhat disappointed.  But, after repeated listenings, I realized that what I was hearing was their neutrality and eventually came to understand that they are honest reproducers of the source (as much as that can happen with these man-made devices)! 
And so this is why this 72 year old man likes his amp/speaker combo.  If there is anything in this world that is more subjective then how each of us perceives sound and music, I don't know what it could be...maybe politics!!  just kidding
     

Lots of variables such as tastes, room amplification etc. All of the B&W measurements I have seen are absolutely not a neutral frequency response. Obviously they voiced this way on purpose. I'm not saying it's wrong. 

When I was getting into home audio and trying to decide what gear to get, everyone told me to get the speakers first. From the specs of the speakers, you can compare/contrast what audio gear will be best suited for you and your system.
Sometime in the near future you can decide if you want to upgrade your power cables and interconnects. If you're like me, you want to do all of this now. However, as the saying goes, Rome wasn't built in a day."

In my experience - and I've owned more than a dozen systems over the years - there is a much more discernible difference in the sound of speakers than in the sound of electronics.  Therefore, you should buy the new speakers first.  By the way, I have a 35 year old pair of B&W 802's that one of my sons still uses in his system. They're great speakers, but for the past 20 years, I have been a convert to Magnepans - I'm on my third pair.  Happy listening. 

What preamp are you using with the Bryston? Another thing to consider would be a nice tube preamp for your front end. This would definitely give you a nice change in flavor.