I got my 2LT coupe RS, manual, NAV, Sunroof, 2500 down for 36 months for 425/month included everything. I traded in my scion though which I had on a lease too and had a negative equity of about 1k. Are you putting any money down ? I would try to have them set it at 450 included everything.
PS Sorry if I am too late on this post but this are just my 2 cents!