I just wanted to say a short blurb on Aretta Communications. I have been using their service for a month now ever since I switched over from sellvoip. I have to say that their service so far has been great with fast communication from their staff on support issues. Their prices are really good with deals on packages (priced by the minute) or straight per-minute-in-6-second-increments pricing.
The prices do end up being more expensive than sellvoip was, but for a service that looks like it will be around a while, it's a small price to pay.