If the poster wants it refinished and get more pride in ownership then I think he should do that. Really, as many people have said: gold, or even a low interest CD will get you better returns than using a gun as a Stradivarius type museum piece and hoping it will go up in value.
As far as aesthetics, some people like the old weathered, patina'd look. Others like it nicely finished. That's why there are gunsmiths who specialize in bluing, parkerizing, hard chroming,...
If you want it refinished then sending it back to Colt to have them do it is great idea but there are probably a lot of gunsmiths in your area who can also do a great rebluing job. I would see if a gunsmith could replicate Colt's deep blue polished finish. Comb the internet and look for images of the same Colt you have and study every angle for how it was originally finished. Then ask the gunsmith if they can duplicate it. Ask to see samples of their work. A good hot bluing job that's well oiled will not only look good but help protect the gun.
But I would definitely not paint it, nor duracoat it. However, it's your gun so (as a well known Youtube reviewer would say) your mileage may vary. If you do decide to "paint" it or duracoat it then be careful if you ever go strip the paint off. Do not chemically strip it because many solvents contain chloride which will eat and pit steel.