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I went through exactly this decision a year or so ago.
Another to include in your list is the Taskahashi Sky90. That can be purchased second hand for the same price as a Megrez 90 APO new - I saw one come up for sale the day after I purchased my Megrez 90APO .
I purchased the Megrez 90 APO over the others because it had the most consistent good reviews as compared to the Meade which had good and bad, and Orion which had good and bad.
My Megrez 90 APO has turned out to be very good. It's not perfect, I do need a field flatenner for DSLR shots through it, but it's a lot lot better than my old Megrez 80 SD. The colour correction on the Megrez 90 APO is great. The field of the Megrez 90 APO is much flatter than what I have seen of the Orions.
What I don't like about the Megrez 90 APO .... that I still need a flatenner (Sky90 wouldn't), and the focuser design of the new scopes is rack & pinnion dual speed. Accurate to focus but not as pleasant to use as the crayfords.
There are a few different versions of the Megrez 90 APO from different times. If you buy a second hand one it won't necessarily be the same as the new ones, so make sure you're aware of what you're buying.
The case that came with my Megrez 90 APO is built like a tank, almost too much so (could be more compact).
Roger.
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