Ahhh Jeez....at least you haven't got some fancy overpriced branded shit that you need to upgrade
Following a similar recommendation, I have spoken to Lee at Platinum In Car this week about my audio system woes in my SLS and he seemed knowledgeable and competent on the phone. If my car isn't fixed by Mercedes this week then my next step is taking it to him and seeing what he can do.
As for budget.....mmm, thats could be almost limitless. It cost me £3k to upgrade the Bose system in my Maserati and that bought me 4 speakers, a sub and an amp (all reasonably top-end JL stuff).
It sounded shit.
I guess you weren't expecting that?
However, this is the unfortunate fact and it has made me a bit sceptical of the aftermarket so am being very careful in my choice of installer this time as I'm pretty sure it wasn't shit because of the quality of components, more I think a poor choice of components for given locations.