I started with a 6" GP 100 and decided I wanted a shorter barrel.
I saw the price difference and jumped on a canadian gun.
I didn't like the double pull. I switched springs and such to lighten it and it became better, but I never got as accurate as I was with the DA/SA. As mentioned above it really limited the options for the gun. I called Ruger about replacing the hammer and they wanted $150, which probably isn't out of line.
I ended up selling it at a gun show and will likely buy another in the future.
If I was going to go DAO I would probably go with an old colt. THe Ruger is great for really stout hunting loads. I would only fire those single action. Not sure if there are any DAO Colts around, so you'd probably have to permanently ruin one.