Contact Form with Required Login feature?

Hi, I’m looking for someone who can point me in the right direction with this.

I’m looking to run a competition on my site and I want to make it so you have to be a forum member to enter it, but not have to competition page within the forum it’s self.

I’m using WP phpBB Bridge, and I’m thinking of using a contact form plugin to use for competition submissions, but what I need to know is if their is one that will require the user to be logged in via the bridge to submit the form?

Thanks.