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Robin at Harrow Technical will service the bodies (I think an ME Super was £85 last time I had one done) and at least you're starting from a known good body then. Having said that you can pick up ME Super body cheap enough so if you've got no sentimental attachment to it then you could try your hand at ebay, etc.
The Pentax K-mount has remained largely unchanged throughout it's life so you can use anything from a K1000 body through to any of the latest K model digital cameras with them.
If you want to have aperture priority then an ME Super is a decent option as it allows manual shutter speed selection as well. If you are happy with full manual operation only then a K1000 is the classic photography student's choice, built like a brick but will work forever. KX then K2 had more features and was better spec. M series bodies are a bit newer and a much more compact design, MX was the pick of the bunch. If money is no object then there's the LX which was the last manual wind pro-level body they did.
Picked up my Dad's old SLRs and sadly it appears they're both borked - Pentax ME Super (mechanical wind) and Pentax ZX5 (auto-wind). Both shutters won't re-open after depressing the shutter button and trying to wind on. The auto-wind on the ZX5 had a bit of a tizzy and wound a new film back into itself.
Fresh batteries in both.
They've both been stored for 15 or so years, and from internets research it appears the shutter mechanism can fail over time. Both borked, or worth trying to salvage ? The ME Super in particular I was hoping to use for sentimental reasons.
Unless they're easy to fix I guess I'll buy another ME Super body (or recommendations for Pentax bodies ?) to use the lenses with.