i just recently spent about $4k on a stereo system for the 02, i'll post another reply with some pics of the custom work, i had all JL Audio put in with custom kick panels so i can return it to stock at any time, i did 6.5's up front, and 6x9's in the back, with their 4 channel amp under my passenger seat....i dont listen to the radio, so i dont have a headunit, just a simple wire that hooks right up to my blackberry so i can use it like an ipod......and just use an equalizer to adjust what i need
the stereo company i used is one of the top stereo shops in the world,(its the place JL audio uses to install THEIR OWN equipment on their JL model cars)
my car was not set up for a stereo, and never has had one installed, so they had to start from scratch. they made the mistake of hooking the power wire up to my horn wire, so when i honked, it made a JOLT through the speaker system, so they had to made a custom relay for it to work and not have any feedback/static in the speakers.
all in all i am extremely impressed with it, the owner of walnut creek customs called up JL audio and told them they should do a small website project about my 02 cause of how incredible it sounds. it sounds super crisp and if you sat in my passenger you would be led to assume i had a 10'' JL sub in the trunk, i'm not exagerating. My 300zx's have all PRO SERIES boston acoustics with JL 10'' subs, along with my bmw x5 having 2 JL 12's, and i'm happiest with my 2002's sound system -
Edit: here are the pics....
here is my equalizer in my center console, its also where the wire comes out to connect to my blackberry for listening to music
6x9's in the back
driver side kick panel with 6.5's, plenty of room to use clutch and spot for front hood latch to move forward and back
and passenger kick panel...
my amp is under passenger seat fits perfect