A B17 is a great saddle and the B17 narrow was designed for those of us who prefer something, er, narrower.........
forget titanium rails- and the cost of them- until/unless you are truly addicted. One of the less expensive options should fit your rider profile and your posterior profile;-)
Imagine the fun you're gonna have, trawling through the 268 threads about breaking in Brooks seats, comparing Proofide with neatsfoot oil, nose up, down, or level?