Did I hear someone say touring ? Saddle first. Brooks. I'm about as sit bone skinny as they come and the B17 works great. Groupset: I'm running a 105 front , XT rear and Ultegra shifters. Flawless for me. You really want to ride with some weight before you settle on a double in front. Long climbs with 50-60 lbs of gear can wear you down. My 24T small ring is completely worthless running around town on the plains of Oklahoma. It was priceless climbing over the Green Mountains of Vermont and Bighorns in Wyoming. Bikeforums.net has a nice touring sub forum. And of course, there's Crazy Guy on a Bike for inspiration.