Changing Head unit

Looking to change the factory JBL head unit out.

My question is what current model headunits (using the idatalink) retain all factory features. Or I guess what feature did you lose? I know there is no way to retain the factory mic. I really like the navigation pop ups on the small drivers display and what not. I was looking at that halo9 , but I see some complain of the resolution. and pop up turn by turn nav features.

 

Kenwood have an idatalink maestro plug right in back, making install and integrating very easy.
I'm 99% sure that no matter what head unit you buy, you will lose the turn by turn nav on that tiny screen. You won't miss it though once you hear the sound quality of the new head unit.