I've collected quite a few used eyepieces and I'm trying to assemble an ideal small set for both deep field and planetary viewing. I have a 10" Dobsonian (f4.7).
I have a very nice 2X Barlow. Once I get my reasonable kit, I plan to start downsizing some of the extra eyepieces.
Here's my current Mix & Match of used eyepieces:
1) Tele Vue DeLite 3mm
2) Tele Vue Radian 6mm
3) Tele Vue 8mm Plossl
4) SVBony 9mm 66 Degree Wide Angle (Gold band)
5) SVBony 15mm 66 Degree Wide Angle (Gold band) (it's sharper than the Tele Vue 15mm Plossl)
6) SVBony 20mm 66 Degree Wide Angle (Gold band)
7) Tele Vue 25mm Plossl
8) Tele Vue 32mm Plossl (this is my favorite eyepiece so far)
NOTE: Affordable two inch eyepieces look bad in this telescope. The edges are blurred and I don't want to drop half a grand on corrective devices. I'm happy with 1.25" eyepieces.