Help buying a acura tsx ?

what year are the tsx's. I personally own a 06 6MT/wnav tsx, bought new 11/06. Since we were going on cross country roadtrips the nav. came in very handy. It now needs to be updated but I do not feel paying $185.00 for it is worth it. With the GPS portable systems the price has come down and worth it and many of them have free updates. I would therefore pick the one without the nav. Check to see if the maintenance has been kept up-to-date. Offer the dealer a lower price-remember you can always come up in price. The warranty for acura is 4yrs/50kmiles. Is the dealer offered any extended warranty. Oh my tsx has 120,000+problem free miles-love it-