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Hi Andrew,
I'm glad to read about the thrill the 10" dobbie is giving you!
You are right with how the eyepiece can be used. But also by upping the magnification on some deep sky objects, the increase in magnification will also increase contrast and allow fainter detail in the DSO to be made out. This is very handy with galaxies and planetary nebulae.
Which eyepieces to get next? I'll suggest a nice 2" 30mm like the GSO SuperView, and the 1.25" GSO 15mm SuperView. These are inexpensive and offer fantastic value for money. The outperform eyepieces more than twice their price in a fast Newtonian like yours. I say this from experience with these EPs, and they remain in my kit.
You don't need a Barlow lens. While today's barlow's are head and shoulders better than what was available, really they get in the way when the high power EPs available today are excellent. The best high power EPs for the Lear amount of $$$ are the TMB Planetary Type II range. A 9mm and maybe the 6mm will be fantastic in your scope. These EPs are far superior to the plossls you currently have and you don't need to rest your eyeball on the eyelens to look into them.
Again, I've also got the two EPs, and I've been able to compare them with EPs five times their price and they out perform these.
But before you lay any money down, try to get to an Astro club or other star party, take your scope along, and ask to try out a few of the other attendees EPs to see how better quality EPs perform in your scope. You be making the best informed choice for yourself.
Mental.
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