Confusion with Colour ICC/premium Sound

[GT0132]

I want to upgrade my car sound system as the stock unit is next to useless perfromance wise . I have a 2004 BA Falcon with standard ICC with the exception that it has the 6 stack CD player

I've seen the postings that allow for a replacement of the standard ICC to a colour version for around $1,100. However if my understanding is correct the colour screen upgrade will make no difference to the sound quality of the CD player unless I then add an amplifier, a sub-woofer and better speakers using the RCA inputs that come with the colour screen upgrade.

That being the case is the $1,100 spent on the colour screen upgrade purely for aesthetical purposes?....I must be missing something here. When I'm sitting in my car 99% of the time I'm driving the thing and looking out the windscreen , so couldn't care less whether the screen is colour, monochrome or even polka dot for that matter. I just want a better performing hi fi set up.

So my question is this. Assuming I spend $1,100 for the colour screen upgrade (and spend nothing else for say a DVD player, sat nav, reverse sensors etc) what do I get for my money besides the fact my screen is now colour and no longer monochrome?

I'm not being critical or complaining here, I just need to understand the whole situation before i decide to proceed.

As I said the key thing for me is better sound but wonder whether the outlay of $1,100 for a colour screen will get me there. If not then I 'd have to consider an aftermarket CD player and forego the ability to use steering wheel controls, or worse use a line out filter on the existing CD player

Cheers
Peter