AC Fred:
Each billing company has their own unique talents. I'm sure any of the top 4 or 5 could provide a solution for you that would work. The trick is to find the one that works best for your site and offers the flexibility and features that you're looking for. Make a good decisoin for a primary. Get a secondary. Be your own judge.
I would suggest you look at this:
http://www.epochsystems.com/sales/ and also
http://www.epochsystems.com/links/ as part of your dicsion making process.
If you need a list of references, you might look here:
http://www.epochsystems.com/sponsors/
You can write to me directly if you have any questions. My addresss is
[email protected].
---Rand