My 2003 Punto Active Sport still has all its original stereo components, the Blaupunkt stereo the active sub in the boot.

Any suggestions? I'm thinking oh replacing the head unit first with Sony or Pioneer with a rear AUX for my ipod, then replacing the speakers, then finally the sub, if there is an active sub that uses as little room as the one factory fitted? Not sure about amps as I'm not sure where they could be fitted with out looking untidy?

Also wondered if anyone knew the size of the speaker bays?

Any comments/advice greatly appreciated.

Cheers.