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Go big with what ever choice you make. I prefer an SCT and I have mine peltier cooled. I used Anthony's idea and adapted it to suit my scope, first peltier cooled SCT and I have a how to on my site. It works and means tube currents and heat plumes are not a problem anymore.
Newtonians are very good too and both Anthony and Trevor's images are testimony to that. Although a big (ie 16") Newtonian will most likely be too big for the PMX.
Forget the refractor. As nice as they are for visual and DSO imaging, the aperture is not wide enough for planetary imaging.
Minimum width now is really a 12 inch in newtonian and 11 inch in SCT. Each will be well handled by the PMX.
I would not bother with an orange tube C14. The later models are sharper and contain better features. ie flat field and cooling slots.
Best of luck with your decision.
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