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An observing night is highly recommended Chris, but if you can't make it to one I'd advise you to figure out what your most used magnification is and buy a widefield eyepiece to suit. You'll be able to reach higher magnifications on more stable nights but there will be a low to middle magnification which you can use almost all of the time (perhaps between 80x to 120x, or a 19mm to 13mm eyepiece).
One well liked option is the 17mm Nagler in which you would instantly notice a wider field of view, and it would have sharper stars further out from the centre of the eyepiece. There's also a half dozen other good candidates to choose from depending on your preferences for cost, apparent field of view and eye relief in particular.
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