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I think the best VOIP out there in the market right now is OOMA. Unlike Vonage and Magic Jack, there is no monthly or yearly charge. The initial cost for the device is little high, $200 but after that it's free. Like Vonage, it doesn't require a computer, just plug the device into the router and connect it to any regular phone set. You'll get a US number and can call US-Nepal for free.
Having said that, I think nothing can beat Skype. I have linked my US number to my Skype account which is just 1 or 2 cents per minute. Whenever my parents try to contact me on Skype the call get routed to my cell phone, so they will never miss me even if I am not at the computer. If I am at the computer then we always do video chat and I must say the video quality is as good as Youtube HQ video.