VOIP recommendations

I currently use Phonebooth (http://www.phonebooth.com/) and looking for something cheaper. I lovers of as particular VOIP solution?

I’m liking Google voice since I last tried it (3 years ago). Anyone have issues with them?

I use it but only very lightly. Basically only use it for forwarding voice mails as text to my email and sms. But I haven’t really run into issues with it.

Can’t really speak to voice quality though.