I go along with the recommendations for a Graphic of some version. These are good sturdy cameras, well-designed and plentiful.
BTW, I strongly prefer the original side-mounted Kalart rangefinder to the later top-mounted rangefinder. YMMV
The Kalart is adjustable for different lens focal lengths; the top-mounted rf requires cams, which are unobtanium.
The original "normal" lens for these cameras was in the 125mm to 150mm range (roughly 5" to 6"). Contemporary lenses included
Kodak and Wollensak, with Alphax, Betax, or Ilex shutters (probably other combinations also).
Get a lens with a shutter. Don't rely on the focal-plane Graphic shutter. It may not produce accurate repeatable speeds.
I prefer modern lenses from the "big four": Schneider, Rodenstock, Nikon (Nikkor) and Fujinon. They're all good, and basically
indistinguishable for image quality except under the most critical examination. Get one in a modern Copal shutter.
A couple of things to avoid...
Don't get a lens with a 'db' mount. Those are unique to Sinar view cameras, designed to work with the separate Sinar shutter.
They're often cheaper than the same lens in other mounts because they don't have an integral shutter.
The Sinaron lenses are actually Rodenstock Sironar lenses re-branded for Sinar. May be more $$ than the regular Rodenstocks,
but with no obvious advantages to justify the higher price.