I'm always a man that shoots for a sexy set up, but after I tried out the Proto CT today, I think some bindings just don't work as well with the board as some others.
The boards a lot more noodley than you'd imagine. Not noodley as in, "OH SH*T I'M LOSING CONTROL", but it definitely bends when you want it too, bends well, and is on the catch free side of things. and yeah you can take it all over the mountain, but I'd say its definitely 100% freestyle. With that said, I wouldn't even think about putting stiff bindings on this board.
I slapped on my 09/10 Union Forces today, and the weight from those bindings alone made the board bend a little when propping it up on a wall. Granted, Forces are probably some of the heaviest bindings; I would steer clear from something similar. The liftime baseplate warranty has pretty much made it entirely out of aluminum.
Ultimately, its what you want to use the stick for that determines the bindings. For me, I love buttering, kinda hard charge groomers, but most importantly, kickers and learning new tricks. For myself, I'm probably going to end up going Forum Shaka or Cartels Re:Flex Restricted or Missions.
A list of bindings that agree with the Proto CT are (my personal opinion):
Union: Contacts, FLites, Contact Pro, Danny Kass FLites
Burton: Cartel, Mission
Raiden: Blackhawk, Phantom
Rome: 390 Boss
Flux: DMCC Lite
and Bent Metal Bindings.