Why would a contractor direct you away from high end equipment??
This sounds wrong already, as someone said already they probably don't have 14 seer available to them. Most contractors quote you a price for a system and add in a little profit for themselves. So they could easily make more profit off a higher efficiency system.
I installed a 12 Seer system in my old home and it works fine, but if I could do it all over again I would get the best I could.