vbulletin would definitely be the way to go for a forum like this. You will probably notice that more users will register once you get vbulletin installed. Also, you don't necessarily need a dedicated server to run it. I used to run in on a shared hosting account with 100+ users on at a time and didn't run into any problems.
Regarding the 503 error, I'm not getting that anymore. It also seems like the site is running much faster. Good work guys!
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