Well the AR7's are more of a park ski while the El Rey is more of an all mountain ski so it would do a bit better in the pow pow. I would say that you should go with the AR7's because you hit the park a fair bit. They can hit the park with tons of pop and still ski the icy groomers real well, although they are on the stiffer side of park skis. I have the AR7's and ski the same way you do and I absolutely love them in the park and they are great on the groomers as well.
2012 Armada AR7's & Look PX 12's
Ski The Beast ~K-Dogg