If you want the latest model with all the benefits (Acute Matte D Screen and gliding mirror) I would recommend: 501CM or 555ELD or 553ELX version II.
I would not recommend the 503CW because you said you won´t need TTL flash nor I think you would need a winder. The motorized models are indeed the best for the money, but the motor and batteries do add weight which can be an issue for traveling longer distances. However, if only equipped with the standard lens, they are not too heavy yet and still compact.
You can also choose a 500CM but as APUGuser19 said, make sure that it is in good shape. The 500CM was sold for a very long time and there were different versions with small changes. The newer the better. There were also a 500 Classic and a 501C, which do not differ much from the 500CM. Regarding the backs: just make sure it is in decent shape, no light leaks, and insert and housing should have the same serial number.
Regarding lenses: C lenses are the oldest. Compur shutter. Optically, they are good but the shutters are old. Better be prepared to have them serviced sooner or later or buy a lens that has already been serviced. CF lenses were made from 1982 to 1998. They offer the best for the money. CFi lenses were made from 1998 onwards. Only minor difference. Better ergonomics, more modern look, some parts in the shutter were made more durable, especially the main spring (this is not to say the CF lenses were not reliable!). Also available as CFE with electronic contacts, but these you wont need. Optically, most lenses have stayed the same over the years. CB lenses were a budget version introduced in 1997. The Planar 80mm CB has the same ergonomics as the CFi lenses, but it has one lens element less than the 80mm CF or CFi lens. There is no final wisdom on whether it is really worse because of this, but if you stop down to f8 I don´t think it can be a bad lens. There is also a 100/3,5 lens which has slightly more resolution than the 80mm lenses and almost no distortion. Many people prefer this for landscape and architecture, but it costs a lot more.
Anyway: My recommendation for landscape off tripod work would be a TLR! But if you want a Hasselblad, I would recommend one of the models mentioned above and a 80/2,8 CF lens, or 80/2,8 CB lens or CFE or CFi lens. Even better: 100mm + 50/4FLE! It depends on how much you want to spend...