Offshore clicks has a good multi-network system, so if one goes down, there are always more for backup, plus they automatically switch to the network that will pay you the most for the call, depending on where it originates. They also have neat features like language autodetection, active x, as well as a system that will send the surfer to a page of your choosing if they start the download and decide to cancel without connecting, so you don't lose the surfer.
http://php.offshoreclicks.com/cgi-bin/ref.cgi?referral
And they've been paying me like clockwork.