As your description suggests, you want active writers with somewhat great English, well let me tell you, i can do both the things, with correct exactitude, I may not have any reviews but i've already won a contest on copywriting, so i assure you work(prodigious work)...
It doesn't matter if you pick some one else, i ain't gonna say you to pick me, i just wanted to tell you that i can create stupendous content..
And talking about how many articles i can submit, I'd say 2 articles everyday, but those two articles, value more than 20 articles that you could get from others.