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Hi Solanum,
I also have a 10" Dob with the same EPs you have. I was in a similar position as yourself a few months back, wondering how to expand/upgrade my EPs.
First off you mention that your barlow is not the ED type. Apparently this makes no difference as the ED and non-ED versions are the same! I now use an Orion Shorty Plus which is a nice upgrade for under $200
My first EP purchase was a Meade s4000 Ultrawide 14mm. This is not an easy EP to find second-hand but I think it is a great focal length EP for a first purchase. You might want to consider the Orion Status 13mm (or Baader Hyperion) as these are around $200. I was going to buy one of these when I found the Meade on ebay.
I liked the 14mm FL eyepiece as it was a good all-rounder. Once I find an object this is still my first choice EP to get a closer look. It is also great barlowed until you purchase a shorter FL EP. I noticed a big jump in sharpness and overall quality compared to the GSO plossls!
A decent low power EP for finding objects is hard to find unless you spend big bucks. I recently bought a Meade s5000 26mm Plossl which I find is good for finding objects and looking at wide views. Any bigger than 30mm is not recommended in our scopes as you may have issues with exit pupil size.
As for a shorter FL for planets etc. My next purchase will probably be an Orion Stratus (or Hyperion) 8mm. This is still a good EP for smaller clusters and nebulae but would be great barlowed to 4mm for planets.
Hope this helps.
Dave.
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