Help buying a acura tsx they both great ?

even tho I do have nav and think it was terrific when I needed it I would go for the one without nav. The nav on my 06 tsx needs updating which cost $185.00 for the disc. (go to acura website if you want to verify the price of the update-it is not $300.00) My tsx has 120,000 problem free miles. The Portable GPS are cheaper and many have free updating.