I used to own the B&W 802D2, along with the Revel Salon2 among other speakers.
I think if B&W is your fantasy or dream, then might as well get the Diamonds. Then add the Diamond Center later down the road. If it is your dream.
The ONLY B&W speakers that get ANY respect from most members are the Diamond series. And even the Diamond series never get any "Best Speaker of the Year" Awards since their on-axis and off-axis measurements don't even compete with some cheap $300 speakers.
Otherwise, there are plenty of other brands that will sound at least as good, if not better, for less money. So many other brands - RBH, KEF, Revel, Focal, Dynaudio, PSB, Monitor Audio, and Internet-Direct companies like Salk and Ascend. Probably other brands I have not mentioned.