Also taking bockers advice I have one of
these which sounds fantastic. Obviously a bit more expensive than £80. I'm told Blaupunkt are good at that price.
I got an ipod kit for the Alpine as well, not sure if that was really worth it. You can change the green illumination on this to amber, and its not a bad match at all. Might be the same on the one Gunzi has.
I also picked up some less than 1/2 price Pioneer 6x9's in halfrauds just after xmas, and the difference they made compared to the standard rear speaker is amazing. Well worth it.