Let's see, Glock has 3 (4 if you include the new 30S model) of .45s. Sig has several models of .45s, including 1911's and guns of their own design. You really have to narrow it down a bit, and tell us what you want to do with the guns. Are they home defense? CCW? Target shooting? We don't have enough information to give you any useful information.
EDIT: You did mention for carry, but that's still not enough information...