Luke -- if I was you, I wouldn't just do it on the message forum. Since there are people who only go to the main site, I think it'd be better if you just had a poll on the main page. Now obviously, it would be extremely hard to do the top 10-20 votes per person, but I think it would reach a much larger target audience.
Like I said, I'm going to post a message about it on the front page. But people will have to go to the forum and send a PM or post their votes. If they're interested, they will do it, and it's an easy way for me to make sure people aren't trying to vote repeatedly.
