Boy you sound like you ought to get that B67. I tried a B17 for a full month of riding. I finally gave up after a 50 mile ride where it just kept getting worse. i have used a B67 (and before that a B66) on every bike i've ridden for 10 years.
I tried to go 'conventional' and tried a terry saddle, some MTB saddles, i sat on a bontrager for about 10 minutes, I tried probably 1/2 dozen of the saddles that you can find in most bike shops and gave up and got back onto my B67. I'd get a B68 if i didn't already have the b67.
Jezbel, since you are considering longer rides, i don't think you could go wrong with the Brooks. and remember, once you get it, you have to have it positioned in the right way. come back and talk to us, we'll help you, as it 's clear to me your bike shop will not.
Good luck!