Well, I started my "collection", maybe "accumulation" is a better term, by accident. Many years ago I bought my first revolver, a 4" Model 19 (which I blew up almost 20 years later, in the late 90s), and about a year, maybe two, later, I bought my second, a 2" Model 10. As time passed I bought another Model 10 here, a Model 15 there, a Model 19, then a Model 586, then a 686+, a Model 27 Classic, and so forth. Before I knew it I had quite an assortment of S&W revolvers and then one day I bought an old, quite gorgeous, .38-44 HD and the LGS owner says to me, "You ought to join the Smith & Wesson Collectors Association".
So I did.
And then I focused on all things .38/.357 and doubled my collection hanging around this campfire and a few other places. It's not as impressive a collection as some might have but it has been fun putting it together!
Model 10s are likely the easiest of the bunch to find, and less pricey if you stick to standard barreled models. You will find a wide assortment of prices depending on where you buy a gun, e.g., a gun show, an LGS, or an on line auction. If you want to call it a real collection try to stick to a theme - my accumulation does consist of a variety of .38s and .357s. Offhand, the only variable is my Model 25 in .45/c and that was a "grail gun" I had to have. .38 S&W, .38 Special, .357 Magnum, .38-44, etc. Nice theme.