17222 Mailing List Manager Tweaking

Okay this is what I need, please read the whole description. Below I have added a link to an open source mailing list manager script. Now what I want is the following. I want to have the ability to provide a website where members could register to create their own mailing lists, by using the script below. So I would be the admin (which would have to be created) and i could oversee all the accounts(suspend, delete, edit etc.). So this will be a member site that has different levels of users on it. All users use the mailing list, however on their own account. I want two member types, free and paid. I also want to be able to edit the header and footer template for both types of members. So if I have a free member, i want an ad mangement system included where i could incorporate an ad to all outgoing emails by free members. For paid members, i want the ability to also edit the header and footer, however i'm only going to put a powered by link at the bottom. I need to accept two forms of payment, one should use [login to view URL] as the processing gateway, and the other is paypal. This project is made for members to be able to register, edit their accounts, and create mailing lists and use the open source script to it's fullest capabilities. I would prefer someone who could use their imagination and add other things they see fit, including security features (really important) and not make it very server intense. Note: this project will have to be able to with stand over a million members as well as entries into their mailing lists. However, if you already have a similar script made, something along the same lines, with all of the features, that is fine as well. (IT MUST BE LEGALLY YOURS TO SELL) This is the mailing script i was referring to above. [login to view URL]