Need some tips on some new powpow skis.?

So I am buying skis this next month so i can snag them while their on sale. The only problem is that doesn't allow me to demo them at all. I am 17, 5'9", 130 lbs., and i love hucking cliffs into a nice foot or two of nice steep and deep powder. I'm a pretty aggressive skier, and there will be days that I will probably be riding in the crud. But that does not matter, I am buying some pos skis from my friend for those days. I am just looking to invest in some powder skis that I am going to fall in love with, and they are hard to find without any demoing. So any tips would be nice. I like the look of the Salomon Shogun and Czar, the Icelantic Shaman, Rossi S7's, and also the Armada ARVs. The models I am looking at are 2011's, last season's. Thanks!