First of all, let me say that I am not a Dewalt guy; however, according to what I read, hear, and see, Dewalt is right up there at the top. At the moment, I think they have the most powerful cordless circular saw (Flexvolt), and they have everything you need, as well as made in the USA (according to you). What's holding you back?
The only complaint I hear is that some of their batteries are not cross compatible. I can't remember the specifics, but research or try posting your question in the Dewalt sub forum for better guidance.