Thanks again.

Regarding the head unit, I am googling for options. Aside from steering wheel controls which I have read can be addressed with the right adapters, the factory head unit integrates with the parking sensors. When I park, the head unit shows a graphical representation of stuff I'm close to hitting. In addition, the factory head unit also integrates with the display in my instrument panel (volume level, track name, etc.)

I guess it's minor in the bigger scheme of things but retaining all the factory functionality is important to me and I'm hoping to find a replacement head unit that will work.