From least to most stiff:
Raiden Blackhawks < Ride Capo < Burton Cartel
This is just how I'd order them. The Cartels and Capos are kinda close but the Cartels are more adjustable and they felt more comfortable to me. There's more flex with the Capos. I'd get the Cartels, they've been awesome for me and are one of the most reliable all mountain bindings around. Good luck with the setup.
Board - 2012 Burton Restricted Easy Livin' Flying V 158
Bindings - 2012 Burton Cartels