Hi Ziggy, it is always fascinating reading others' thoughts on EP's.
I have an f/10 SCT, which I assume is the same f/ratio as yours.
If you are looking for a good EP for both planets and DSO, I agree with the other comments about the 22mm Panoptic. Marvellous!
I recently bought the 22 Panoptic and a 13mm Nagler to upgrade my EP collection. I use the 22 Panoptic far more than the 13mm Nagler. More nights than not, air turbulence around my area will not support the magnification of the Nagler (192x). Mind you, when the seeing is up for it, the Nagler is fabulous too! I could not recommend any EP more highly than the 22 Pan.
I am currently trying to find some thing with a little less crank than the 13 Nagler. I'm think of something around the 16-17mm mark, and the Orion Stratus is on the top of my list at the moment because of financial constraints.
Good luck with chosing. And happy observing!
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