Welcome to the Board!
there are both purists, and modders on here! fear not to post anything you like on the cars... don't paint flames on the car though... heh.
I've played with several wheel combos in my cars. it's hard to get a set that clears the odd tie-rod design on the 123/126 though. We've got a
Wheel and tire forum on here for that too!
for the Head unit, I install different things here. I feel the original becker or the baukpunkt look best, but without modding them, they don't have the features many on here want. I've got a slideout touch in mine at the moment. subs are difficult to make work right on our cars due to the fuel tank kinda blocking the flow... venting through the first aid kit helps.
we've got a
car-audio-multimedia forum as well.
Welcome aboard!