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C9.25 is a great scope for planetary. Despite the C11 being obviously larger, many people comment that the C9.25 has a slightly better design for planetary ( but I forget the details why).
The only problems with both are the their long focal lengths. It is easier imaging with a shorter focal length.
I understand that the only difference between the CGEM and CGEM DX is the DX has thicker, heavier legs. The C9.25 sits well on a CGEM even with two cameras and a guide scope. Personally, I wouldn't put a C11 on a CGEM if I was going to add a guide scope on top.
If you are going to have a large CCD chip, the EdgeHD would be great. Also, it cools faster than the standard C9.25.
You are always best to work well within your weight limits (and budgets). Better to have a 9.25 that is easy for mount than a 11" that is pushing the mount. For visual observing - have aperture fever. For imaging - have mount fever!
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