Dunk, his scope is f/10 like mine; 2000mm focal length. I recommended a 12mm EP; that gives him 166x magnification, just as you recommended.
For the record the EP I use most, on nebulae and open clusters, is my
2" 42mm Bintel/GSo Superview. For $60 you'd have to call it value! That EP would give Steve 47x magnification, and give a pretty nice view of Eta Carina ...