Credit Card processor - your recommendation

Wondering if anyone can suggest most compatible, most reliable credit card processor to use with cs-cart ie. Paypal Pro, Authorize net or any of the other payment gateways etc?

Currently using Echo, I believe they were recently acquired by Quicken or some similar company. In either case it’s been over a year and not a single issue. Rates are great and with gateway and other fees I pay around $22~$24 a month.