Get a B-67 no question about it. I'm 225lbs and I ride 150 miles/week. All my previous experiments are now wall-hangers. There's nothing like coil springs.

Trek 520 with B-67 and North Road bars:
http://i2.tinypic.com/r9il8g.jpg

Trek 830 with same set up:
http://i2.tinypic.com/r9ilok.jpg

The Mighty B-73 Barco-lounger
http://i2.tinypic.com/r9im3k.jpg

EDIT: There's alot of testimonials on Brooks saddles in general over at How's Your Brooks Saddle Treating You.