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Jeelan,
I found I was usually using either LV50 or LVW42 as the lowest power then switching to 22 or 13mm.
When assembling my set I had originally bought a couple of 30mm eyepieces (NLVW and a TMB Paragon) but rapidly found them pointless and sold them.
Personally I wouldn't bother with a 17mm either, its too close to 13mm or 22mm.
IMHO you really only need 3 eyepieces:
a) lowest power your scope can handle (basically a field stop as big as you can get in the barrel)
b) a medium power about 1X per mm of aperture, this equates to an eyepiece with a focal length in mm equal to the focal ratio of your scope, or a tad less; this will be the one you use most when the seeing is average to poor;
c) a high power about 1.5X per mm of aperture, you might use this occasionally when seeing is really steady.
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