I personally have very good things to say about Vonage, but thats on a being a client of theirs side.
I am not sure if you are looking for a provider, or someone who you can resell services through.
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I am too on the hunt for an SIP (VOIP) provider, however with features/abilities URI wise similar to voxbone.com's - but without the hefty fees to be able to select the DID you want (not custom DID but select from an available list).
In any case that said, currently using les.net and voipcheap.com and happy with both (looking for another that has competitive trunk pricing, but with flat-rate and not per minute).