Get the Regal, Marco. I've heard the same stories about the Johnson resos. I can say that, although it's not a "National", the workmanship on the body, neck and frets are very good. Once you get the intonation set by turning the biscuit/cone assembly a bit, it stays in tune better than my old Gibson ever did.
I've heard that Amistar also makes quality resonators but have not been near enough one to try out. I think they are made in Czech Republic aren't they?
You might try posting over at the Tweedboard also, as there are a couple reso people that check in once in a while.