It's not just vBulletin. You could go get Invision, phpBB, Mambo, etc, and you'll still have the same problem. There is just no way to permanently ban a technically saavy person from a website, or forum as the case may be.
The only other option that I can think of is if you can get this guy's IP Address and hostname then try calling/emailing his Internet Provider. Detail to them all of spam posts that he's been generating on your forum and what not. Most likely they'll take action that will, AFAIK, make it more difficult for him to access your website.
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