I have a 4" 1969 Python with factory nickel finish. I guess it was an old LEO wheeler as a lot of the finish is worn off on the holstering side of the barrel and cylinder. Sooo, I want to have it refinished. If I do it in blue, i have a local gunsmith who does beautiful work. If I want it re-nickeled, I guess I have to send it back to Colt for a pro job as nobody locally does nickel work, and I have some reluctance to sending it off to strangers. Which finish makes the gun easier to sell? Blue or nickel?