Replying to BEST ALL MTN TWIN

I need some help deciding on an all mountain twin. I have last years AR5's which i will sometimes use, but i want a ski that can do everything...be just as good in the park as on the groomers, trees, and powder. The workers at my local store said that either the ARV or MSP would be a good choice, especially because i wanted a wider ski for when i go to alta...but i cant decide between the two and time is running out...the only complaint they had of each was the MSP was a little stiff for my height and weight (5'11", 140 pounds) but that the ARV is a little soft for an all mountain ski...pleassee help