"Guess and check" with $100 saddles seems like a good way to spend a lot of money and still not be comfortable.

Might be a good idea to find an LBS that lets you test ride saddles.

FWIW: I ride this on my geared bike - http://www.roadbikereview.com/mfr/pe...2_2509crx.aspx
I rarely ride my geared bike less than 30 miles, and for a low-profile seat this one is pretty comfortable in the long haul. Did a century this past weekend with no trouble... really feels good once you get settled in around mile 15-20.

Also helps that it won't break the bank at $50 MSRP (and Performance has some sales going on you can probably get it cheaper).