Good things come to those who wait, right?
I would not rush into anything, especially into pressure sell tactics ---> "you have to decide right or I'm selling it to someone else"? Please!
No matter what you end up buying, just take your time and do it right.
If you love the sound of your current BP10s, then just build on that. If you don't love the sound of your BP10s, then audition other speakers in your room.
Getting 3 more BP10s brand new would cost you around $1,100. David Gaudreau on this forum might get you a better deal.
Anyway, I've personally listened to the BP10Bs in my room, and I think they sound great. A lot of people say the same thing, including Julian Hirsch (RIP) of Stereo Review. But you be the judge. Do you love the sound of your BP10?