Hmmm.....I guess I really screwed up here.
The grasses you selected are not native, but they may in fact be OK depending upon what you are trying to accomplish. They certainly aren't registered as noxious weeds, but then there are a lot of things that are really bad that aren't... yet, which may be something you don't want to deal with later.
I am no expert on establishing native grasses. In fact, I am currently doing an experiment where I hope to re-establish a few small meadows. It isn't easy or cheap to do, nor should everybody just be expected to attempt it, much less punished if they don't succeed. I just wanted to learn how to do it.
What I can tell you is which natives seem to grow well by location, depending upon soil, competitors, water, and weather. I can also tell you which natives compete better with weeds. I can tell you who the good vendors are. I don't know a vegetation contractor but I know those who do.
Let me know if I can help.