Having just experienced dealing with a salesman at a car dealer, I thought that some notes related to buying a car might come in handy.
Simply stated…I would not communicate with a salesman more than I have to.  For example, never ask a salesman if he would change the offer if you agreed to buy a warrantee.  Any time I have asked a question or showed any interest in buying a certain car,  it has resulted in miscommunication and confusion.  That is why I recommend buying a car based on using a car buying service website from USAA.com  It is hooked up to their find a car service and allows you to “build a car” and then get a guaranteed price from a dealer.   This website is pretty powerful and even has graphs related to how much that car has been sold for over the past 12 months and what the average cost has been.  You don’t have to login or be a member to use their tool.

Another way to do the same thing is to use Truecar.  Seems to be the same software.  It is so much easier to review everything in writing.

I am recommending that you can only buy a car that you have a confirmed quote in writing.  Once you change any little thing, the salesman is going to start confusing the issure and making your life miserable.