.... On your personal view of "quality".
Within the price range, off the top of my head....
Beretta makes the CX4 Storm
that is modular, futuristic and polymer in construction. The weapon has very few components to take apart to clean, something along the lines of the Glock. It's light-weight, easy to carry. I have only played with them at SHOT, so I don't have any field info to provide I am afraid...
Olympic Arms makes this model
. While this price is a little higher, I have seen them all over the internet in the $750 to $825 range. I have, now 2, Olympic Arms receivers now, one is finished and one I am building. They have treated me well so far.
Rumor had it that Microtech
was going to turn out their AUG styled STG line up in a 9mm variant. I believe the price would be a little more than $800 though - however their gear is very well made, if you like the looks of the weapon.
What's the interest? Just out of curiosity...