Sipura
I use the Sipura SPA-2100, which I bought separately and provisioned myself for Broadvoice (unlimited to 24 countries, $22/month with taxes included). It has a built-in router with QOS and two independent POTS lines.
It works reasonably ok, but if you do get it, since it's new, most VoIP providers will not be of much help. The plus side of it is that if you make the changes yourself, it won't be locked, and you have two lines to play with. Also, since it's not locked, you can set 911 (or any number you like) to call any number you like, including the local police station, by creating your own dial plan. It's highly configurable.
Vonage is reasonably good, but they don't have BYOD (Bring Your Own Device), and I'm a person who doesn't like "contracts" and "disconnection charges" and the like!
The best quality I've found is in AT&T CallVantage - it sometimes sounds better than a POTS!
Dave
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