I would second the Taurus 66 suggestion. I have both the Taurus 66 as well as a new production Smith 686. Of the two, I find myself shooting the Taurus more.
The Taurus has a better DA trigger pull, better factory grips (for me), and a less obnoxious looking lock. The Smith fells like it is built better, but that is probably just due to the extra weight. The Smith has a much better SA trigger pull...pretty much perfect.
Both revolvers shoot similar groups. There is definitely not enough "better" in the Smith that makes it worth the price difference. If I could do it over again, I would have bought a used pre-lock Smith and hopefully gotten a better gun at a more reasonable cost. At more than $700, the 686 is a gun I sometimes regret buying. Especially when it performs so closely to a gun I got for less than half of that.
The Smith is also more picky about ammo if you reload. I have found it does not like full-power .357 loads using CCI magnum primers. I think the concave firing pin bushing overworks the primer edges. I have gotten pinhole burns on the FP bushing several times on the Smith from this combination. This does not happen on the Taurus, which is flat at the breech face like the older S&W's. It is not a huge issue, since it does not happen with Winchester Primers and I have modified my purchasing accordingly.
I can't comment on Ruger GP100s. I have only owned one Ruger revolver and that was a SP101. I didn't keep it, but that was an ergonomics issue not a functional one.