I don't know which Brooks is the most springy, but I am at ~170 lbs. and the Brooks Flyer has plenty-o-spring for me. It is like a B17 with springs.
Wouldn't want any more bounce. I have ridden it in drops as well as with a bolt upright setup, and it has the same bounce to it, I feel.
I can definitely feel the springiness as I ride over bumps and bad pavement.
Note that at high cadences the saddle starts to bounce, so I wouldn't look for too springy if you like high cadence.
The B67 is a wider saddle than the Flyer if you are looking for something wider.
Also note that while the above mentioned saddles are single rail, and should fit any modern seatpost clamp, some of the other sprung models are double-railed and need a seatpost that has a clamp for double railed seats. Or, you could get a seat sandwich clamp and use it on a straight pipe seatpost. I think that is how some do it.
wallbike.com has an unconditional 6 month return policy on their Brooks saddles.
Last edited by lungimsam; 08-13-13 at 02:48 PM.