I have a 10GB Kenwood music keg with soundgate adapter that I used in my '03 MCS that I just sold.
It's a great way to load up mp3 and not make any mods - it connects to a cd changer interface in a boot and controlled through steering wheel controls and stock radio (not sure about HK). It includes music keg itself, soundgate adapter, software and usb cradle. The cool thing is that it announces artist/album name.
price is $250 including shipping, obo

 

bump - lowered the price

 

If that were closer to 30+GB, I'd consider it, but 10 is WAY too small for me. Sorry, hope you can sell it. This system is something I have drooled over for a long time. I love the fact that you can sort by genre, album, artist, or title, and the keg will tell you each artist, genre, album, etc. Perfect for those with an older head unit that doesn't display mp3 tags.

 

I belive you can get bigger hard drive, up to 100+, but it's obvious will cost more

 

Keg arrived in the mail. Will tinker with it soon.

 

thanks, let me know if you need any help installing!