Thanks again everyone for all of the thoughtful and detailed responses.
So much information, and SO many options I didn't even know were out there.
As I said previously, I'd like to try all of them, but unfortunately I can't do that
without collecting a lot of items that maybe I wouldn't use or like, and spending a lot of money.
So here's what I did.
The local shop has a little spot out back where you can go test fire a new gun and the like. He had a Hawke Model 12134 in stock. (Previously I said it was a 12131 but was mistaken)
I went to that shop, the man behind the counter mounted the red dot, we went out back and wala!
I did better in the 20 shots I took there than I did with all my shots previously.
The difference was, I wasn't guessing at anything.
I could see what I was aiming at, both eyes open, no reading glasses needed.
Now I can work on keeping the gun still instead of being frustrated over the sight
picture I was not happy with.
I've learned a boatload of things here, and still may wind up exploring some of them. For right now, the red dot is what I will work with and see what happens.