Hi Mick,
How many years did you get out of the CGEM-EX?
I have not used a Losmandy mount, but from what I read you can expect that it will last many years and parts can be purchased if needed.
A well looked after AP 900 would certainly be my pick over the others (I have been happily using a Mach1 for about two years now and I am not planning to part with her). However, if you are not doing any long-exposure astrophotography, then perhaps any of the other two would be sufficient?
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