I just ordered a 3rivers Dalaa so that I could do away with multiple bows and just change limbs as needed. I think there is something to be said for sticking with the same bow; once you get used to the "feel" of a certain bow, switching to another can be iffy. If you want to hunt with 55lbs, I would definitely get the second set of limbs much lighter, like even low 40's. The heavier bow will mask form problems that will show up immediately on lighter bows, and you can shoot longer without wearing yourself out. If you keep arrow grains per pound the same with both limbs, speed will be almost identical, so your mind won't have to adjust for different trajectories when you shoot (if you are an instinctive shooter). Good luck, Paul.