I just got a 2004 330 Vert. It's fairly clean but needs a few bits doing, so thought I'd better join a forum to see what's what..
It has the H/K audio and I would (initially) like to change the head unit, but it seems it's probably not going to be as simple as I first thought! I'm still reading through relevant threads trying to get my head around it.
Anyway, looks like a decent forum you have here