No offense, but probably many will take it... how the crap can 2/3 the kids on this site have no idea about bindings? "what kind of bindings should go on AR5s?" I mean crap, the same bindings work on every frickin ski. There are like 5 or 6 different bindings that work just fine for free ride that are solid with a high din. So here you go:
If you are lightweight and don't need a high din, Salomon s810 if you want a lightweight binding, lookp10, Rossi scratch, axial, power 100s if you want a slightly tougher but heavier binding.
If you are medium/average weight or do normal riding (hard pack, park, with occasional pow) then get something with a din of 12 or so to be sure. Salomon s912 Ti if you want a lightweight set up, Look p12, Rossi scratch, power, axial, or FKS 120 if you want a tougher, heavier binding.
If you are a big skier, or what a burly binding you will want a tougher, high din bindings. Recommendations include Salomon s914 (yes, they are actually metal and tougher), Look p14, Rossi Scratch, Axial, or Power 140, FKS 155.
Unbreakable bindings for those who are rough on their skis and/or weigh a lot: Look p18, Salomon s916 or s920, Rossi FKS 155 or 185.
I am not really recommending Line or 4FRNT bindings because they have yet to prove themselves. Not saying they aren't great, just dont a lot about them. weeeeee