For both DIDs and VoIP termination check out VoIP Innovations, the only "perfect" carrier for US termination and US & Canada origination in my eyes. Never had an issue with them but they require a minimum commitment (not too high).
As far as international calling goes, grnvoip.com is a pain in the but to set up but I can help you along the way, not bad at all when you use the premium routes. I use the cheaper standard routes for first-world countries but I stay as far as possible from them when it comes to US termination. Bad experiences. I hear callwithus.com is also good for international calling, dirt cheap rates but per minute billing. I will be testing them out sometime this week. VoIP Innovations should be releasing a more competitive international rate deck sometime this month.
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