I've got a 13mm Baader Hyperion and a 17mm (well, actually 2 x 17's - for my binoviewer) and these ep's are the most used in my scope - a 12" dob with 1500mm focal length. I used the same 2 ep's more than any others in my 10" dob as well, that sort of fov and magnification make a sweet package for the dobs especially when you don't have the luxury of auto tracking as Eric pointed out.
I bought an 8mm Orion Stratus and even that I use maybe 1/6th as often as the 13mm. Forget the high mag stuff at present, it only works in very clean & clear conditions. My advise is NOT to spend for example 1/3 your budget on an ep that will get used only 1/10th of the time, that's bad economics. Instead spend something like 40-50% of your budget on a good 13mm or so ep, because it WILL get used 50% of the time or more!
Cheers!
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