I agree. Full plastic construction is a nogo for $150. I was able to find K2 Sweaters for that price and I'm totally satisfied (I ride everywhere, mostly groomers and park). Great bindings. Also, I've heard very many good things about Rome 390s although they might be soft for pow/backcountry riding.
Do you live near an REI store? I recently went to mine and they were having a 15% off all items on sale. I found a pair of Burton Mission bindings for $90 because they were on clearence along with the additional 15% off. At my REI they were the last ones so if you do have one be quick. I have ridden with them twice and love them. It's crazy but they are my favorite pair of bindings I have used. Durable construction, don't have to worry about breaking anything including the ratcheting buckle which has always been a fear of mine. Also they are very Comfy!