I'll be installing my new compact crank (Ritchey WCS 50/34) here shortly. I presently have an Ultegra 9spd drive train with a 12-27 cassette. I'm just wondering if a 12-25 would be better reference big jumps when changing gears. However, I do live in the mountains so the lowest gearing would really be helpful! I know, a triple crank is an option, but I thought I'd give the compact system a try first. Any suggestions would be appreciated.