The Trek 7.5 FX Disc is cheaper, pricewise, but is all shimano derailleurs. Pretty much even or some would say "near clones" of each other, BUT the Mendota has a carbon fork which will give you a better ride. For some, a carbon fork is worth the extra money spent esp on an aluminum frame. For the $40 difference, I would get the Fisher (plus your LBS is giving you a nice discount). Test ride both of them and then decide. Both should be plenty fast on the flats and have enough gearing to tackle whatever hills you may encounter.