Right now I'm paying for the basic plan with 1ShoppingCart which includes it's autoresponder & shopping cart services.

I'm considering switching my autoresponder service to aweber and am looking for recommendations of alternatives to using 1ShoppingCart to sell my products & services.

I obviously need the autoresponder service and shopping cart service to integrate together so when I sell a product or service to somebody that's not on my list that they are added to my list on aweber if I switch to it.

What do other people recommend to use with aweber to sell products & services?