I'm fond of the advice that every collection needs a good medium frame .357. I got nothing against .45 Colt but, given the choice of a .357 or a .45 Colt, there ain't no contest.
It is a bit of a strange choice, those two. I'd have a lot more trouble deciding if it had been .44 Spl instead of .45 Colt. .357 would still be the first choice for an "only" gun, but I'd have to have both before long.