I'm a bit further ahead than you.
I was not sure of what I REALLY needed, so I got a somewhat lower cost Omega/Toyoview monorail, just to get me going.
I figure it was low enough in cost that, if I wanted to change to a different camera, I would not be out that much $ after I sell it.
Most of the stuff is movable to a new camera. The only camera specific parts are the body and 2 lens boards. Everything else can be used on another 4x5.

BUT the Toyo monorail is not a field camera, or at least I have not figured out how to pack it compactly for travel. So it is limited to home or close to the car.