Looking for a shopping cart script / plugin

Been looking around, can't seem to find one that will do what I need it do. I need a shopping cart plugin that has a membership integration. I'm going to be providing a variety of services (some subscriptions, others one time purchases), but I need the clients information saved... for them to be able to login and view their orders.

Possibly be able to communicate with them through the membership panel, and directly email from the admin panel -- have custom deliverable files to each client etc. Any recommendations? Basically looking for a digital serviced based script or plugin for WordPress.

Bump, no one? I figure using a client management solution such as WHMCS would be sufficient? Any other recommendations?

s2member plugin for wordpress could probably handle what you're looking to do. I like it.