If your doing a WM site I would definitely go for 800 x 600 Most of the more professional webmasters I know (i.e. those who do it as a living, rather than as a hobby or an extra income) would assume you don't know enough to set it at the lowest common denominator if you set it higher. And from that they would assume you are a newbie and that there is no point in looking at any webmaster site you create because they would assume you don't yet know enough about the business to run a webmaster site.
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