It's a good advice what you have received here. I had a 8'' dobsonian and that eyepiece. It's comfortable, the lunar and planetary views were very good and the apparent field of view (60º) it's enough to keep the planet in place for some time.
Just in case it is for any help, these are the eyepieces I used:
- GSO Erfle 30 mm. Then I changed it by a Explore 24 mm 82º. BIG galaxies, open clusters and nebulaes.
- Hyperion 13 mm 68º. An ES 14 mm came afterwards. Galaxies, open clusters and nebulaes.
- Celestron X-Cel LX 9 mm. Globular clusters such as M13. Lunar and planetary. An 8 mm would be also great.
- Meade HD 6,5 mm. Lunar and planetary.
You could consider also an economic 5 mm planetary eyepiece. Manual tracking becomes harder and seeing will not tolerate very often that magnification (depending on your observación place, of course). I had one, but the truth is that it stayed in the suitcase almost every nights. No Barlow in my case, I find them useful under different conditions than observing with a dob.
Thanks for your advice! After lots of reading I am thinking the ES 100 14mm might be my next eyepiece unless I can get a better TeleVue used. Although I am still thinking the 9mm ES100 might be an option too. Any thoughts on the 9mm vs 14mm ES100? My primary goal now is to see at least some twinkling stars in M13 - right now it's just a small gray cloud.