B-17's will do fine with a little drop, but not more than a few inches, has to do with the angle of the nose in making the proper 'hammock' for the boys. I ride in the drops quite a bit and never have an issue with comfort. You should do fine with a regular B-17, that's the most popular model for a reason. The Narrow is just a bit smaller and (for me anyway) not as comfortable on the sit bones, but everyone is different. Also consider the B-17 Champion Special. Same basic saddle, but nice oversize copper rivets - very classic look. If you do want more of a saddle for racing, check out the Swift. This was one of the first I tried, but too narrow for me.

I own 3 B-17 Specials - one steel and 2 Ti, combined over 50,000 miles on them. Couldn't be happier and would never ride anything else.