Looking for a billing company for x-rated shareware
 

I'm getting ready to enter the x-rated screensaver shareware biz and I'm looking for a reliable, reasonable billing company. All I need is a place to process payments and email registration key
for me. No membership stuff involved. I been looking at using http://www.netbilling.com Does anyone here have any experience with them? Or can you enlighten me to other good billing companies I should look at? So far I've been running free and AVS sites only. So I'm kind of new to the billing stuff. Any suggestions would be appreciated.
:helpme