Congratulations o a great collection. When I go to gun shows or look online, I used to look for very specific guns and barrel lengths. That did not seem to work out. Now I just look at everything and see if anything suits my fancy. Something usually turns up.
Fortunately there are some very good shows in my area. I picked up a 64 three inch about a month ago. Last show two weeks ago I purchased a 65 four inch in excellent condition for $ 435 OTD.

This weekend is the OGCA. Always 2 or 3 things I want.