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this is how I do it:
nebulae - i usually stay around 50-150x, depending on size. Obviously larger objects are best at lower powers whereas smaller ones command higher mag to tease out extra detail. However, don't be afraid to expirement - I've viewed Eta Carina at 280x and found all those small dark bays, inlets and lagoons very fascinating to study 'close up'.
planetaries - larger ones look good at about 100-200x, on the smaller ones I go all out and push it to over 500x when seeing permits.
galaxies - larger objects are best at around 100-150x, smaller faint stuff warrant powers of around 200x-250x.
Globulars - I like 250x on virtually all globulars.
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