I happened to notice some of the newer Audi's use a similar big caliper and rotor setup too actually...might be an option for what ever setup I happen to build in the future for something.

Oh, and...
http://cgi.ebay.com/ebaymotors/2010-Merc...=item2566ce2bab

http://cgi.ebay.com/ebaymotors/AMG-Merce...=item415d5f33fb