We went with CCBill - their setup was a cakewalk, they pay out webmasters weekly, their interface has lots of options which came in handy, and I never heard complaints about them being down...
IBill - has been giving problems in the past with the uptime, they pay out bi-weekly, and I heard their webgood/webbad pages are a nuisanse to sep up...
Lexxx
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ProfessionalCash
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