I've had my 1851 Navy repro for 41 years. It has given me outstanding service I'm sure in line with the original. Every time I use it I'm amazed at how accurate it is especially since the rear sight is a notch in the hammer! It's branded Euroarms of America but I'm unsure of who actually made it. It had to be made by one of the two companies you listed as they were the only reproducers back then I believe.
Start with a '51 Navy the most popular handgun of the 19th century then move up to a Dragoon or some other Colt in .44. Don't forget the 1858 Remington which is an outstanding weapon as well then move off into the likes of a Star or some of the many other lesser known models.