Now that I finally got a Python next on my list is a Diamondback (.22). What are the basics to know? Is it the same with the Diamondbacks as it is with the Pythons, the earlier ones are more desireable? I have seen Royal Blue, Stainless, and Nickle but which one will hold its value better and in what barrel length? I personally am not partial to length or finish but am more interested in collector value. Any help will be great!