The Polaris is definitely overpriced at $11,000. It's not a premium priced window.
As far as the Renewal salesman talking bad about vinyl, that is to be expected. In my opinion, if they didn't tell a bunch of falsehoods about vinyl, then they wouldn't sell but a fraction of the jobs they do. They slam vinyl windows to try to eliminate them as competition.
By the way, if you talk to the Renewal by Andersen salesman, ask him why Andersen makes vinyl windows if vinyl is so horrible!
On another note, I'd like to give you some off site advice that I'd rather not post about your quotes. Email me at: firstname.lastname@example.org