Replying to Bindings for Kartel 108's

I picked myself up a pair of K108's about a month ago and was looking for advice on bindings to mount. I'm planning on spending the winter in revy and use these as my all mountain/touring skis on and off resort. I've been thinking about getting a pair of shift's but I'm kinda skeptical how they'd hold up in hard pack, hard impacts and butters. Also, I think CAST might be out of my price range unless someone can sell me cheap pivot 18's hahaha.