He may not have been out to "screw" you...I have found that many people in sales positions have no idea what they are selling or they have no info about promotions or advertised discounts. He may have simply been clueless.

I find that it is very important to be completely knowledgeable about what you want and what you want to pay for it. With NO emotion, lay it out and end the "conversation".

Some more detail would be good...fill in the Xs...then we could get a better idea of the "deal". I would really like to know what kind of car would have $10K in "equity".