Hi Chris,
I was also thinking about direct replacing the front and rear speakers with some after market ones (i.e of the same size). I have no great plans for an ICE system, just a upgrade over the stock 182 one.
Im looking for a decent HU (MP3 is a must!) which has an inbuilt amp to give some life to the aftermarket speakers. Let me know how it goes for you ... and any recommendations you have.
KnightAzul