I too have a C9.25 and find it an awesome scope that takes silly high magnifications ( 500x plus = 3mm , 4mm and 5mm TV Radian ) on those few great nights but I find that 100-200x is about average for most nights .
I have the 32mm Celestron Axiom , the older version of the Luminos and find it a very good eyepiece , anyway as said I would look at the very fine and well priced ' Superview' 15mm from Andrews giving 156x as these are the best bang for buck going today bar none !!
lots of people use and love these and to tell the truth I could not see a difference when compared to my 15mm TV Panoptic in my C9.25 at 10x the price
scary but true . ( slightly worse in my f6 scope but still good ) .
Showing that you don't have to spend a fortune to get good views .
Then as I could afford it grab one of those sweet Long Perng planetary eyepieces from Andrews in the 10mm size giving 235x for high power .
You will find these 2 eyepieces are under $100 for both and perform great in the f10 focal ratio of SCT scopes .
Brian.