Website Payments Standard and IPN integration with ecart and Dreamweaver

Use "Website payments pro" in the wizard. (or really any of them, since you are going to remove that functionality at the end anyway you are just using it to add the express checkout option)

Then you will have to delete the credit card form and only allow the express checkout option on the checkout page and you can delete the confirm, success, and failure page since you will only be using the pp_confirm and other pages that start with pp_ for the checkout.

IPN offers no advantage over express checkout other than it doesn't require php code, and since webassist extensions will write that code for you pp standard isn't a real logical solution to use with the cart.