Stay away from Ebay, avoid any eyepiece marked with "H" (hygenian) or "SR" (ramsden), and don't bother with Kellners or "Modified Achromats". I've read some negative reviews of Celestron's X-Cel ED eyepieces (and its clones such as the Orion ED2 and Saxon ED brands) so I wouldn't buy these without trying them out first.
You can't go wrong with a decent plossl, these provide good image quality and are relatively cheap. You can find these at Bintel for $40 a pop.
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