Originally Posted by **********

Netbilling is the cheapest, and they also have the ability to to let customers add funds to their accounts without having to re-enter their card info which is a good way to keep customers in private chat longer.

Epoch is great too, especially if you are EU based because Epoch supports Paypal payments.

CCBill is great of course because their affiliate program can bring you more sales, faster.

Segpay is very easy to integrate, and if you ask nicely, they may give you a per-transaction discount. (Hi Cathy!)

All of the processors above are great. Contact each of them to find out what's involved then pick the one that works best for you.