So he didn't want to talk to the little lady(no offence meant) but rather the man of the house. Does he not know women are the decision makers on things like this anyway?
Personnally, anytime I've got quotes for windows, I've always found a local supplier who was cheaper and better then any of the national firms. Suggest you tell him you'll think about it for now, go out and get some quotes in, and if his reduced price is still better, then ring him up and tell him that you'll do business with him, and the price quoted and he has 24 hours to accept, otherwise you'll go elsewhere.
I'm sure if you post where you are on here, you'll probably get some names of firms that people would recomend