ThisAuditioning, as already indicated, is the best way to make this choice, but I understand the challenges in doing so and I've not always auditioned myself.
I'd strike the LS50s from your list. They have many qualities but you won't get anything like the best out of them with the Sonos, and they'll be quite exposing of the areas in which it lacks. As referred to above, the B&Ws are easier to drive, though they can be quite exposing. I have a pair of the original 606 and from reviews it seems the s2 version is even more exposing.
Q Acoustics would be a good lower-risk option. They don't particularly stand out at anything in my experience, but they're easy to drive and easy to listen to.
There's also the Monitor Audio Bronze 100s. I haven't heard those myself, but I'm very impressed with the floorstanding Bronze 200s, and I've enjoyed several MA models in the past. I currently have the 200s in prime place with my Wharfedale Linton 85s and B&W 606s on the sidelines.
I’ll try and get some MA or Elac Debut speakers which are front firing only. And then have a fancy dinner from the money that I saved. Cheers all