I have been scouring the net looking for an image gallery script that will fit the following scenario:

Guest visitors to the site can view pictures in organized galleries (like Gallery, Yahoo photos, etc).

comments about the image are only available to be read by registered users. to view the comments, a user can click on a link, register, and pay a membership fee via paypal. IPN is a requirement.

I have seen many scripts that support membership (4images) but lack the paypal integration. I have seen other scripts that have paypal integration, but is aimed at selling the photos rather than membership.

Any ideas on scripts that can accomplish this?

I'd rather not have to make this overly complicated by integrating a gallery with a message BB that supports the payment option, but that's an idea to consider.