DH1633pm, a lot will depend on what you plan to do with the gun. Range use only, personal protection, hunting, etc. You also need to determine your preference of gun style and caliber. You have two semi-autos and two revolvers...which do you prefer.
1. I have a Delta Elite Gold Cup. It was my first 10mm. It is a hoot to shoot but it is mostly a range gun when I shoot it. I would love to have on in .45acp.
2. I have a customized Browning High Power that is one of my carry guns. It's accurate, has never jammed and is also a hoot to shoot.
3. I have never owned a S&W 686, but I do have a 3" Ruger GP-100 in .357mag that is another one of my carry guns. I really like that gun.
4. If have a 7.5" Redhawk with a 2x handgun scope and a custom 4" Redhawk that I crafted from a 5.5". Both are in my favorite caliber of .41mag. I have hunted with them both and the custom 4" is my field carry gun. I had originally ordered a Redhawk when they first came out in .44mag, but the gunshop owner accidentally ordered the .41mag. I took the .41mag instead and began my love for the caliber.