Agree, the Norma is a great camera. Its controls fall to hand easily, it's versatile, and there's one in the Museum of Modern Art for industrial design. If they're loose they can be easily adjusted or rebuilt (caution, don't adjust unless you know how).
They can be packed or carried pretty easily, and people usually buy a 6" rail and slide both standards on to it for packing. A solid 4x5 Norma will be around $400-500 by itself. We can't tell from the description of lenses because their prices will depend on manufacturer and model, age, condition, maximum aperture, condition, single or multicoating, condition...
If it is a good price, I'd go for it. It's fully depreciated so you won't lose anything if you decide to sell it.