your clueless, no offence. i have had three pairs of invaders (paid for one, other two got on warrenty).
Anyways i rode my invaders everywhere thinking "powder is fun but its pretty hard/tiring". Then the day that changed my life came, the day i tried my friends ARG powder skis. I just about cried i was so happy skiing on powder. It was a whole new kind of skiing. I now have a pair of 178 anthems mounted center and a pair of 179 Hellbents mounted center as well.
There is absoltuly NO comparison between them. using fat skis is just a whole new type of skiing. i guarentee you anthems are NOT a powder ski. they are super fun on groomers though!!
they are a bit wide compared to some park skis. but they are a completely symmetrcal park ski. dont think you can combo them as a powder ski.