Posted By Joplin Motisher-Chittenden
University optics eyepieces are generally accepted to offer the best "bang for the buck" so I'd suggest starting with them. I would go with a U.O. 16mm Konig, 12.5mm ortho, 9mm ortho, 7mm ortho and a televue 2.5x powermate. That would give you a sequence of powers from 40x to 228x with no major gaps. I suggested the powermate since it is generally accepted that it is a superior design to conventional barlows. If you need to wear glasses while observing or prefer a lot of eyerelief, the Orion ED-2 series would probably be your best option. Also, if you don't already have one, it is a good idea to invest in a quality 2" mirror diagonal. Here is a link to a good explanation of magnification:
If you can, get out to a local star party and look through various eyepieces to see what you like best. Sometimes, if you are polite and offer views through your scope in return you may be able to borrow eyepieces to see how well they work.