Time for a stereo upgrade

[Locobob]

Well I've managed to pull apart just about my entire interior - getting ready to do a carbon fiber (American Hydrocarbon) refinishing job. So I got to thinking that maybe it's a good time to update my stereo. There is nothing really wrong with it but it would sure be nice to have a touch screen, bluetooth etc. etc. At first I started looking at doing a complete system replacement - head unit, amps, speakers.... but things got pricey and complicated really fast. Now I'm thinking that maybe all I want is a new head unit + adapter. I upgraded my Bose amps years ago (100w rear, 75w front) and honestly I think it still sounds pretty good.

Any ideas or suggestions from the audiophiles???

I think I'd prefer a unit without Nav... rather have a separate GPS up in the windshield area.

Could I install a new head unit, keep the Bose amps and speakers and also install a separate sub? Not sure where I would put it... don't really care for those big boxes eating up the cargo space.