I think you should not even consider moving your forums to a subdirectory.
1. All the PR you gained on your forums links will vanish.
2. The more deeper the links on your website the less PR they ususally get.
Like if your forums are at /home/username/public_html/ with a PR 5 and then all your forums are likely to get PR 5 as well
Now is your forums are /home/username/public_html/forums/ then your forum root will have a PR of 5 and your forums will get a PR of 4 only. (just checkout my forums or just have a look at vbulletin.org forums itself.) so general rule of thumb is that deeper the links the lesser the PR on them.
After one year of operations, i am considering moving my forums to root to get some usefull PR on my forum links.
The beauty of vBDrupal CMS integration by tamarian is that you can install the Drupal on a separate directory like /home/username/public_html/drupal/
and yet it is fully working with vbulletin. Latest version even allows you to install on a different domain and yet it is wonderfully integrated with vB.
Regards
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