I'm 51, female, 5'7" w/ 31 or 32" inseam. I currently ride a Marin Lucas Valley, aluminum with flat bars. I'm looking at getting a more traditional road bike but with relaxed geometry and carbon frame, such as a Specialized Roubaix or Trek Pilot. The Marin's gearing is 54/42/30 and the Roubaix is 50/39/30 for a triple (which I'm pretty certain I want). I want comfort since I tend to do longer rides (charity rides and such). I thought the flat bars would give me that but I feel that the Marin has a pretty jarring ride, although I haven't tried the carbons yet, so can't really compare. Anyway, my question is: what sorts of differences can I expect with regard to the gearing, the ride, position, etc. Has anyone else gone from flat bar comfort bike to drop bar comfort bike? I'm wondering if this is the right move for me, or should I look at carbon frame flat bar bikes, or something else? I'm also going to look at women specific bikes, although I think I might be taller than those bikes anticipate. Any tips, suggestions, comments would be appreciated. Thanks!