hi anyte - -
i have a k1000 that i got way back in 80'. if you get a k1000 make sure that it is an older one with a metal body, the new ones were made of metal-looking plastic or something. mine jumped out of a backpack when i was chasing a bus ... it has a little duct tape on it but still works fine
the newer ones i don't think would have fared so well.
i also have a me super and use it pretty often. it too does not have a DOF preview ... and i don't really miss it. cameras and lenses that i currently own that do have DOF preview ... i never use it ...
the me super weighs a fraction of what the k1000 weighs - titanium shutter, and is tiny. you might spread a wider net and think about one of those as well ...