Is a custom VB Plug In the right way to go?

[SirMoby]

Hi,

I have vBulletin, Joomla and Community Builder installed and I need a customer database app written but I don't know where I should try to integrate it.

I want to keep weekly records on members. It's a few simple numbers for each member that need to be updated every week with the date they're actually updated. I want to run reports on those numbers by date range and member.

At some point it might be nice to create groups and run reports on groups of users. I'd prefer to keep users from logging into different applications and of course registering to multiple applications would be an issue.

Is a vBulletin plugin a good way to go or should I think about plugging in some place else?