The US Firearms Rodeo and the Cimmaron P are 2 affordable Colt clone style revolvers. Both are pretty well made, although I give the nod to the Rodeo.
Rugers are strong and can take a beating with heavy loads, but they are not even remotely similar to Colt SAA clones. The chambers to not line up correctly on the New model Rugers to eject the empties, and New Model Rugers do not even use a half-cock. Rugers also lack the hammer mounted firing pin.
Rugers have 2 clicks when you pull the hammer back, Colt clones make 4 clicks. Even the grip and balance do not feel right on the Ruger, compared to a Colt or Colt clone.
I own a few Ruger single action revolvers, but I bought them to shoot often, and I don't have to worry about babying them with light loads. OTOH, with the Cimmaron and US Firearms Rodeo, they are suseptable to going out of time with heavy loads, and are not meant to be fired often (except with the lightest Cowboy loads).
Since you seem to want something very similar to an original Colt SAA, I would recommend the Rodeo.