If you are going the route of "gunsmith fit" barrel, rather than just a new, Colt factory barrel, you'll want to spend more time on who's going to do the fitting, than on the barrel brand; pick your 'smith and go with the barrel he prefers.
If you're the least bit handy, installing a Kart . . . Accu-fit (I think that's what they're called now; I installed a couple when they were called EZ-fit) barrel can be fun and rewarding.