My buddy just sent his Sami case to OTT to have them double it to a Sidekick case, $600 to do it. His Sami case has the 6.0 (I think) in it and the 'kick case is stock.
http://www.ottindustries.com/kicker3.htm
Ive been thinking of doing that as well, but I got some other stuff to do beforehand......