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Hi Stefan, the 50x per inch rule Andy refers to would only apply in almost perfect conditions. I have a 20 inch scope, and I have NEVER, in almost 5 years, gone higher than about 500x. Under average conditions, I tend to stay at about 200x, which would translate to about 10x per inch.
Andy's suggestion that you only go to about halfway on the 50x per inch rule is no doubt much closer to reality, and even then, in very still conditions only. If you are looking to invest in a good EP, you will use high power eyepieces the least, and midpower eyepieces the most. I expect something around the 10mm mark would be close to your sweet spot.
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