I'm in the same boat. I'm currently looking for something that I can put in my 97 BMW M3. Obviously I can't get one of the head unit based ones, unless it will fit in the sunglass holder. I also looked at the alpine systems with the seperate LCD screen, but I don't want to stick a mount to my dash for it. I want to be concealable. Are there any other M3 owners out there that have a GPS system? Let me know what you have, or if you have any info on a GPS system that might work for me.