I don't have a lot of experience with brands outside of salomon, rossignol, and volkl, but I've had one pair of volkls that have been absolutly bomb-proof. I've had them for 3 years and they have yet to see a drop of ptex, to give you an idea.
My first generation Scratch lasted through three years of having the shit kicked out of them, until they snapped. I would say Volkl, as they have a good reputation for well built skis, and Head, because they use so much resin and reinforcement.