The title for the fastest SUV (just over 200 mph) goes to the Barabus V12 GLK.  The bi-turbo V12 and all the goodies to keep it on  the road and stop within the same zip code come with a starting price of over $570,000.  But think of the bragging rights.

This rig has tremendous braking power.  Watch this video on brake service to be sure that your vehicle is up to the task.