[Freeswitch-users] decent VOIP provider

Hi List, I am looking for recomendations on a good VOIP provider to terminate my FS calls to the PSTN in the US. I need a company that can handle hundreds of calls originating at once. so far I have tried: binfone, iaxtel, sixtel, vitelity, voipjet and bandwith.com the last one is the only one that works, but its very expensive (of course). any ideas? thanks