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Meru
The situation is a little clearer. The factors to consider when choosing between the 10 and 12" dobs in my opinion are.
1) Light gathering. There is a noticable difference and at 12" the are a lot of faint fuzzies that bcome available. But if I was only an occasional observer and was doing imaging as well, I would probably only be looking for brighter objects, and the 10" will still give great views.
2) Size and physical capacity. 8" and 10" dobs are still easily handled if you have any physical issues. I know some women have trouble with 12" and if you have back trouble a 12" would be hard to handle.
Weighing up these factors against $1000 is something you need to decide.
With EPs, I believe the best option is a selection of EPs giving a variety of powers. The 2 options you gave had powers of 96 and 93 respectively, so probably much of a muchness. I use a 17mm Ethos as my main EP these days which gives 88x but with a 1deg FOV which I use probably 80-90% of the time.
Malcolm
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