imo you'd be insane to want the new lifes for a park ski... they are a stiff, fat, charging ski.  do not think would be fun at all.
one life on the other hand i think would be great, if you are looking for a rockered park ski.  not incredibly fat and stiff so they are manageable but the rocker makes them very nimble and have a great jibby feel.  i would reccomend them.