I got a Zhumell Z8 Dobsonian. The stock lens is decent, I think. One is a 68 degree Plossl and the other is a zoomed in Plossl that I don't know as much about. I want a new lens so I can get better views. I am mostly interested in deep sky objects, seeing as there are only a handful of planets to look at. My 68 degree is far better for that. So, what type of eyepiece should I get?