[Wavytone]

So your scope is f/4, f/5 ?

To start with you really only need 3 good eyepieces - low medium and high power. On your scope that means one around 30mm, the 13mm you now have, and one around 4-6mm (high power).

Apart from Televue, ES eyepieces are good, as are Vixen SSW and SLV (one of these would do nicely for high power). Vixen LVW are also very good though they are big and heavy, like a hand grenade, but no longer mad. While these are pretty much secondhand only, a few shops still have the odd new one left.

Also don't underrate plossls, there are some excellent ones.

For high power views of small objects like panets a wide field is not necessary, while maximum contrast and no ghost images are highly desirable. In this respect eupepeiece types with the lowest number of air-glass surfaces are better - even with modern anti reflection coatings - and for this reason there are a few types that stand out:

Monocentric, particularly the TMB monos,
Zeiss Abbé Orthoscopics,
Plossls.

To this add some of the modern designs including the Vixen HD, SSW and SLV.
Naglers and radians have many more air-glass interfaces and the result is more scattered light and lower contrast.