Well, here is my list anyhow.
Netbilling, for processing via own merchant account
www.netbilling.com
CCBill, for 3rd party processing
www.ccbill.com
Paycom, for 3rd party processing and merchant account processing
www.paycom.net
As far as I am concerned, those are the only real options. These companies have been around for a long time and have an established reputation in the industry.
For volumes of over 75k per month, send me an e-mail me [at] kevinkraft [dot] net.