Like some other members I have several Pentax KX bodies, three now.
Its SPD meter is superb and I like the full exposure information analog display.
However sometimes I prefer the simplicity of the Pentax KM. It has "less to break".
The K1000 is simpler still, but I can't bring myself to use an SLR without DOF preview.
Interestingly I don't bemoan the lack of DOF preview on my viewfinder type cameras.
I agree; for long-term use get one or more Pentax mechanical cameras.
Get them serviced by Eric
NOW. He won't be repairing them forever...
Chris