I'm not in the market for a 4" 19-2, but if I was offered a NIB for less than $500 I might not be able to resist. That being said it wouldn't become my carry piece, because I couldn't bring myself to harm the finish with a holster. I can appreciate your desire for a stainless steel gun. There are certain advantages. As for collecting value, in the long run I would guess that blued guns in great condition become more valuable with time because they become increasingly more scarce due to the difficulty in maintaining their excellent condition. Just a guess however. Check Gunbroker if for no other reason than to see availability and relative pricing between the various models. Without the benefit of looking I would guess you will see more 66's in excellent condition as compared to 19's. Also, the snub versions of both are "hotter" than the 4 inch versions which seem to be slower movers and cost less than their snub brothers. Your money, your choice.