Replying to chronics vs. stl's vs. msp's - which should i get?

i'm looking at getting one of the above, it'll probably be the msp for it's all-round abilities, but i'm a bit worried that the ski won't perform on hardpack. so i'm also considering the chronics and stl's. i guess i'd favor the stl's but i've heard they're soft and shite outside the park. i'm 5'3 but reasonably heavy and strong, and i load up a lot of pressure on my skis so i want something pretty stiff, but i'm a bit of a novice in the park so i'd maybe be wanting something a bit softer in there for learning butters and stuff.
it's likely i'll be skiing 30% exclusive park, 60% on piste hardpack, 10% pow, so i want a ski that'll carve good, and basically be an all-round performer. i live in australia and ski also in new zealand and aspen so i'll be skiing pretty variable snow conditions.