I have a Kodak Tourist and a Rodenstock Clarovid. The Tourist, despite costing me all of $10, is in perfect condition and is very solidly built and braced. There were many versions, some with cheap Kodet meniscus lenses and one shutter speed, and the top of the line with a 4-element coated Anastar lens. Mine is the middle of the line with 3-element coated Anaston f6.3 lens. Modification for 120 film requires a grinding tool like a Dremel, which I don't have, because the area around the spool is solid metal. So I respool onto 620 spools, which is not too difficult. The Tourist is front-element scale focus, but the viewfinder is relatively big for a folder. There is a shoe (not the right sized shoe to hold a flash) that was designed to hold an accessory Kodak rangefinder. I generally only use it stopped down to f16 and it's quite sharp there. The camera has strap lugs and is comfortable about the neck. So, don't be afraid of respooling; it's just time-consuming.
I consider both of my folders as toys, and for more serious work I generally use a modern 6x6 Bronica. I think coming from an RZ you may be disappointed by the limitations of old folders and their lenses. You should consider a modern non-folding 6x9 rangefinder like the Fuji "Texas Leicas".