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Matt,
Any eyepiece in answer to your question should work, then it becomes an issue of preference and budget.
Not sure which FSQ106 you have but unless its the FSQ106ED with the extra back focus you will need to get a hold of Taks special 2" FSQ diagonal and the adapters, otherwise you might find you cant reach focus or you will have to view straight through - which might get a bit hard on the neck at times.
I think that some 1.25" diagonals can be made to work but not sure.
The FSQ106 is perfectly fine for visual and with its amazingly tightly corrected spectral range there is not going to be any false colours and fringing common in most APO's - the moon is very clean.
There is no reason why you couldn't achieve a magnification factor that any other similar sized scope in the same seeing conditions could yield if the seeing permits
eg 190x with a LE 2.8mm or 150x with a XW3.5
Add the Tak 1.6x adapter and go higher if the object is bright enough.
The Pentax XW series is quite superior to the Tak LE series for my eyes !, but so is their price too.
Obviously aperture helps greatly with light gathering and so having less will be more limiting especially compared to your SCT, adding in a nebula filter can improve on nebulae viewing by filtering out some of the light pollution and this will improve contrast.
Have fun.
Rally
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