Trust me, a bit of weight sacrifice(and I mean, a really tiny sacrifice, we're talking 300 grams, about a third of a pound - I can lose that by sweating, or wearing less clothing...) is an insignificant price to pay for the last saddle you will ever own(besides, the weight of your tires are more important than obsessing about the weight of a 2 pound saddle that doesnt rotate), if the Brooks works out for you. Get the B-67, sprung saddles will really help alot even more so than suspension seatpost, I was told. Spring saddles are also considered superior in absorbing shock and just generally more comfortably than an identical saddle, sans springs.

I own a B-66, it is identical to the B-67 in terms of the saddle itself, only mine has two rails.