Membership Script Suggestions

I have several membership sites I want to start on various topics (which are of no importance to this discussion. My requirements (or "like to haves") are as follows:

• Works seamlessly with WordPress
• Content dripping (based on maturity of subscriber and/or "x days after y post" as in module 2 comes one week after module 1)
• Works with multiple membership sites
• Works with multiple payment processors (like ClickBank and PayDotCom, for example)
• Integrates easily with autoresponders like Aweber and GetResponse (of course, only one at a time)
• Multiple membership levels with "upgrade" functionality (perhaps pro-rated upgrades)
• One time payment as well as recurring and recurring with trial and/or free period

I've tried MemberWing and WishList Member. The critical sticking points for MW are: Aweber integration is not so good. It's new functionality and it may just be me, but the "recurring with trial" subscription doesn't work.

Sticking point for WLM: No "easy" or "intuitive" content dripping. I understand there's "sequential" content delivery, but it's in the form of Module 1 is for Membership level 1, then upgrade membership to gain access to the next module (where the upgrade is free, automatic, and sequential), but setting up a weekly "post" for an entire year takes 52 sequential memberships, which is onerous.

Sticking point for both: Since both require an IPN set up, and both ClickBank and PDC have only one or two IPN form fields, you can only set up a max of 2 membership sites. What if you want 3? Do you have to open another account at said payment processor?

Another key consideration is ease of testing. Does the IPN work if a "test sale" is made on CB or PDC?

Thanks in advance. I know I've laid a lot out here. Some thoughtful comments and suggestions will be appreciated!