Get rid of the Dunlavys?

A.
I auditioned the sm1's versus the 805's (not the signatures) extensively with the same equipment, and purchased the sm1's. If you have a chance you might want to listen to them with the same equipment and in the same room to draw your conclusions before swapping into the B&Ws. It strikes me that the sm1's were particularly good for acoustic music and vocals.

Seems to me that you're contemplating more a lateral move than an upgrade. I would normally advise against that path. I am not familiar with the Denon, so take this for what it's worth, but you might want to consider whether it's the electronics in front of the speakers that are giving you the upgrade itch?

I would keep the Dunlavys and upgrade the electonics instead.

Will