Pave,
Yes, the 67 is the stainless equiv. of the Model 15.
And yes, the 15/67 are the adjustable sight variations of the 10/64.
The 65 is the stainless version of the Model 13.
The 66 is the stainless version of the Model 19.
The Model 14 is out of production.
Now, it sounds like you're looking for a new gun.
If, however, you want a Smith & Wesson, get a USED gun. You may not have heard about this, but it's a political thing. I don't know if you're familiar with the deal that S&W signed with the Clinton administration, or how it would (with severe government interference) conduct its legal trade.
If you're interested in learning more about how this deal threatens your rights as a gun owner, and the rights of your children, and their children, read the text of the agreement (click on the link in my signature line), and then search TFL using "Smith Wesson agreement."
There are also some solid reasons for getting a used gun other than politics. Most, if not all, of S&W's blued guns have been dropped. Stainless steel is about the only offerings these days in the frame size you want, unless you want to pay for a performance center gun.
The new design has the firing pin mounted in the frame, not on the nose. That requires a somewhat heavier mainspring, and correspondingly heavier action.
I'm not crazy about the fit and finish of the latest crop of S&Ws. The actions aren't as good as they should be, and quite frankly, I think they are over priced.
The used market is, however, virtually awash with S&Ws that are virtually new, lightly used, or moderately used.
The police and civilian move away from S&W revolvers in the 1980s & 1990s has depressed prices on the used S&W market in many areas of the country, and probably will for quite a few years to come.
I bought a 4" Model 10 slender barrel at a gunshow couple of years ago, in VERY good shape, for $152.00.
I ended up selling it to a friend who also appreciates S&Ws because I wanted to finance the purchase of a different S&W.
I bought a like new 6" Model 28 for $300, and an unfired, 99.95% 4" Model 28 for $250.
It's still a buyer's market. Go buy!