If you haven't tried them I recommend Websitebilling.com. Great bunch of guys who are always willing to help. We also use CCBill and they are great too.
PayPal is my favourite tho. My users seem to like it (I do about 3/4 of my billing through PayPal) and nobody else even comes close to their discount rate (approx. 3%!!!!!). I have heard bad things about PayPal but my personal experience with them has always been VERY good.
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