I think the better Pentax 35mm bodies are rather like Subarus. Not many people know much about them, but those who've owned one find it hard to be without one. Plus an MX is just as happy carrying on until the terrain ahead doesn't count as a road.
Medium format SLRs have to be the Land Rover Defender. They're endlessly reconfigurable and often feel like a lot of parts in close formation rather than a solid whole.