If you like/prefer "blue" add a 586 to your list..... blue version of the 686.
Well I didn't pick one but I picked two... a model 66 no dash and a model 10-6. I have a lot of questions about the no dash. The 10-6, other than a couple marks in the finish, is in excellent condition.
1976 will be silver washers on the stocks. They will be over $100 for a set that matches the condition of your revolver. It is quite possible that by 1976 they we no longer putting stainless rear sights on them, and the front sight has a factory insert. Someone here with more knowledge is likely to chime in eventually.
Finding a single stock to match the style you like better is not an insurmountable task.
I am unsure at this point you can overpay for a solid Smith & Wesson revolver of the vintage you have. We will not see their like being manufactured again, so if you paid a little more than todays going rate, tomorrow it will seem a bargain. The enjoyment from owning such a fine sidearm far outweighs the cost.