Replying to Need help with new powderskis!

I was thinking of buying some new powderskis and need some help. I'm trying to decide which ones I should get. I'm thinking of using the skis for powder kickers and regular freeriding in deep pow. I reckon that the skis the shouldn't be too heavy if I'm supposed to be able to to spins and flips easier? It would also be preferable if the skis where true twintip with a rocker. I'm not really sure what the rocker does and how this an advantage? If someone could explain that it would be much appreciated. Thanks for answers.