I am also looking for some new bindings right now, to throw on a proto.
I do some pretty technical riding (steep tree runs) so they need to be responsive, but I am getting more into freestyle so some play is also required.
I have 2011 cartels and they are the easy to get (in Japan) solid choice, but I would like to mix it up a bit. The NOWs look sweet but are not really available in my size here.
I will look at raiden, flow and K2. The cartels are still in the mix if I don't see anything I like better.
Any other suggestions welcome as well as specific suggestions within those brands.