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The 17mm yields 138x and a nice 1.7mm exit pupil.
This would become your workhorse eyepiece and probably get more use in the scope than any other.
I also think the 17mm yields better contrast than the 13mm, but that is really subtle.
The 13mm (181x) would just be a bit too small a focal length for everyday use on tons of objects. Seeing would interfere more and the 1.3mm exit pupil is getting kind of small (i.e. dark).
I think you'll enjoy the 17 more, and when you need another, get the 10mm first. I find it identical in optical characteristics to the 17.
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