I just purchased my G23, and already thinking of adding to the family. I like the G21 but, with that comes a different cal=more for ammo. It would be for mainly HD, so should i just K.I.S.S. and look to another .40 or grab the .45? everyone says you gotta have a .45 in your arsenal but, with the right ammo(like hydra-shocks, HP etc) would it make much difference?