I have a wide backside, and am considering a Brooks saddle, due to the seemingly ecstatic feedback I have read. My question would be which one to get? It seems that the B-17 is the most popular. I have seen some B-72, a B-66, and some B-67 models. I realize that the difference is some are sprung, and there are many variations. I want a saddle that is comfortable. I am NOT a racer, and will be customizing a Schwinn Traveler to my needs. What are your suggestions?