my friend skis in vermont and new jersey all the time, he skis 80% park and 20 all mountain and he goes out west often too and skis mostly powder there, hes 6 foot 1 and 165 lbs
I would suggest the Anthems, for 80% park they'll be ideal, they are also fatter for tree skiing in pow out west, so unless he charges fairly hard lines when not as his home mountain, the Anthem should be fine.
goto go with the anthems. i used the invaders last year on steeps and pow in taos and wolf creek and they performed just as well as in the park. so i goto think with a wider waist the anthems would rip all over.