I use Authorize.net with 1Shoppingcart. It works pretty well. I'm starting to come up against some technical limitations (like a lack of trigger emails for shopping-cart recovery), but overall, I'm very happy with the solution.
EJunkie and Payloadz are actually very good for simple shopping carts. In fact, they can do some pretty complex stuff like cross-sells and affiliate tracking. When you start finding yourself hitting technical limitations (like upsells not working the way you want them to, or you want to do more complex trials), you'll know it's time to upgrade providers.
EJunkie and Payloadz are actually very good for simple shopping carts. In fact, they can do some pretty complex stuff like cross-sells and affiliate tracking. When you start finding yourself hitting technical limitations (like upsells not working the way you want them to, or you want to do more complex trials), you'll know it's time to upgrade providers.