All I can say I have never been disappointed with the images through my 3-6mm Nagler zoom.
The RKE's are only available down to 8mm. You will need a Barlow to get reasonable magnification on any short 60mm APO refractor. The RKE's are cheap so if you get one you haven't lost a lot if it's no good.
I think perhaps a larger instrument would be a better choice than trying to get the most out of a 60mm APO/eyepiece combination.
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