to be honest, if you cant meet any IVR supplier face to face and work out who they are, they will most likely end up fucking you over. Standard sort of thing steal your numbers, re-sell your lines, skim your traffic etc
which is just pretty much fair game in the shark pond. There are a few decent ones, but they probably wont want to meet you either for the same reasons, LOL.
Just to get an idea how many K of texts or K of mins are you thinking of driving a day ? Might be a better indicator of who you might want to hook up with.