Well, since you mention not liking landscapes on 35mm, I suggest you get the Mamiya, or at least some other MF camera. 645 is three times the area from 35mm, and this is very noticable in prints, but I usually shoot 6x6 for convenience and because I happen to like square compositions. The case could be made for the Pentax 67 or whatever, but it'll be made by other people because I'm happy with my 6x6 SLR.