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Best medium power DSO f/l EP is generally considered to be one that provides ~2mm exit pupil, which in your scope is 10mm.
There are many 'premium' choices around this focal length, starting with the Pentax 10XW, considered by many as perhaps the best. Others include, yes, the 13mm Ethos, Pentax 12.5XF, the various Naglers and then at 14mm are the Pentax 14XW and the Denk 14mm.
All excellent EPs with varying FOVs, eye relief etc and price tags.
Get along to some observing nights if you're nervous about outlaying $200,$300,$400 or more - I don't really recommend a newbie spending $400 on an EP sight unseen, but I also think an effective strategy is to purchase a few (ie 2-4) quality EPs, rather than 8 or 9 ordinary ones.
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