I don't have an exact answer to your question, but note that the zoom levels are discrete, not arbitrary. There may not be a zoom level, out of the ones available, that exactly matches your 500m=150pixels. One easy way I Start by going to google maps, enable the scale bar in google maps labs (the little green beaker up in the top right corner), and count the pixels for particular scales at particular zoom levels, and you'll get a sense of the basic ratio of miles to pixels and how it changes as you change zoom levels. I'm sure there's a more exact method to use in the API, but I'm rushing out the door atm, and that should serve as a good starting point. :)
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