Okie John:
My vote would be to go with the 5 inch barrel. That gets the gun back to the condition you used it in and it's a fabulous excuse to call Milt Sparks and order a floral carved, black 200 AW holster for it. My bride and I gave our son a black, floral carved 1AT for his 1911 when he graduated from college. He'll tell you it's the only reason he finished his degree. I "think" he is kidding but it is hard to tell. That said, it is an absolutely gorgeous holster.
Nothing wrong with keeping the 4 inch barrel on the gun in order to economize on holsters if you absolutely have to do the whole "responsible adult" thing.....
Hang onto the 6 and 4 inch barrels and hopefully you run across 2 S&W Model 27s that need to be re-barreled.
Bruce