Hi i have a k2 www that i used my previous bindings on. (Ride Ex) The problem is that i really like my all mountain board and I dont wanna retire it yet. Its some off brand from about 11 years ago but damn is that thing stable on the slopes. I don't know how seeing as to how flexy it is. It may be getting old. Idk if its supposed to have that much flex. Would that make it flex more? I know the core is poplar. Ayways I want to keep riding it especially in powder since its got a real turned up nose that throws powder under it. But i need some all mountain bindings. The only all mountain bindings I know of are the ride lx's. And there may be better choices out there.
K2 Auto Uprise is a good all-mountain binding. Not as stiff as the likes of Targas, but mid-stiff so it's a versatile binding. Takes a little extra time to fine-tune the fit, but worth it in my opinion.