Horatio,
Mike hit the nail on the head. Your two magnifications are two of the most commonly used ones in general astromony.
Now I will give you my standard advice, use your scope a lot, learn to set it up and align it, get a feel for what you want to look at (Erik was right the Messier objects are a strange group of objects), learn to navigate your way around the sky and most of all see if you can make contact with a local astro society.
After a while you will get to know what you really want to view and will make informed descisions and not end up with a draw full of expensive paperweights.
Before new eyepieces a red torch, planisphere and a set of 10x50 binoculars would be a good set up IMHO.
Keep looking up and asking questions.
Cheers
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