Pioneer Avic-Z2 Head Unit - $1,660.00
Bluetooth Module - $97.00
Ipod Module - $50.00
2DIN faceplate - $199.00

Bortmonitor 16:9 CD - $889.00 (does this play mp3's? even)
MK4 GPS DVD CPU - $999.99
Bluetooth Module - $799.00?
AV/TV Integration - ?
Satellite Radio Module - ?

Seems like it will cost me way more to go the OEM route for ultimately less features. Would be nice to retain the onboard vehicle information, steering wheel control integration, and OEM look but how much is it going to cost me for used stuff that I cannot use on anything other than particular BMW models? And how much wiring will I need to do to add all the modules?

Of course I could also go the OEM route peace by peace, since I have an existing MK2 cpu and updated NavTech CD. This installation would be cake at least to start for just replacing my burned out 4:3 head unit.