I love the ride of aluminum . I am at 200 lbs currently and always loved super stiff bikes.

I have a dedicated steel cross/touring long distance bike, but I always loved the ride of my Cannondale Caad3 and then CAAD8 for fast rides. I have not tried it over 120 miles, but I suspect it will be fine for longer distances also only much faster that the steel rig I have. To me the ride quality depends more on rims and quality of tires(tpi) than the frame material.