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Your scope is a fast Newtonian, which means significant coma and field curvature. For best results, choose eyepieces to match your scope, ie ones that have a curved field to match and negative come, Some do, many don't.
The right choice also depends on your preferences. If you don't care about wide fields and are more interested in image quality, in your scope a set of Edmund RKE's would be a good match. Ey are still available new online from Edmund, and secondhand sets do come up on Astromart.
If you want wider fields and are prepared to tolerate images that aren't so sharp at the edge of the field, your call. Any from the cheap Chinese clones to ES eyepieces, Televue, Pentax or Nikon.
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