Which voice client do you use to chat in game?

Which is the best voice client to chat in game. One which does not affects your ping much?

I'm not sure about how much it affects your ping, but I've found that Ventrillo has the best quality.

Thanks guys. Will try Ventrillo.

Ventrilo has the best quality, Teamspeak being second.

I can't compare it to any other programs (because I have never used others) but I use Vent.