So after a few months I’ve narrowed down the voip providers I use to the following:
I’m using voip.ms for all my US based DID’s. So far it works really well. It also supports SMS which is a great added plus.
I’m using flowroute for outgoing domestic calls.
While localphone.com has great rates as well as DID’s from all over the world (and lax verification on if you’re actually a resident of such places) it doesn’t scale well. I use it for one dutch number, but when trying to add multiple numbers, I haven way within Asterisk to differentiate between the DID’s coming in over the same trunk.
LocalPhone.com has good outgoing call quality and prices, so I’m using it for all my international call routings.