Take a look at the Russell Day Long. Custom made to fit you & your butt. I've got 2, love both. I rode my V-Strom 9 hours, 7 in pouring rain. When I got off my butt was smiling. My bad back didn't complain.
RDL's made hundreds of GW seats. Check out their site. You chose your material, style & color. Only bad part is, they have to use your seat pan. You're out of a ride for 2, maybe 3 weeks. Well worth every penny & wait.