I think it depends on the nature of the contest....if you are using the results for specific marketing material then you (Topaz) should absolutely be the one to decide a winner.
I've seen other forums that have weekly and monthly contests. Winners get a "trophy" next to their name in their ID banner when they post and in their profile to show they won a contest. The results are judged by all the members. You can only vote once and not for yourself. They are based on a theme "word". Only one entry per person and the picture HAS to be taken during the week/month of the contest, so you can't just dig up the best shot you took last year.
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