One thing to remember nowadays you don’t need to update the head unit unless you just don’t like Sync. Good speakers and a amp along with a DSP to clean up the sound makes a huge difference. Then sound deadening around the speakers in the doors with some foam surrounds and you a nice little system.
Use your phone either android auto or apple carplay. Just plug it in to the USB port and it appears on the screen. Much more accurate than factory built in navigation