Replying to ~$400 to spend on a new quiver

Anybody want to recommend me on which skis to buy?

Since I'm not spending that much, I'd probably get an older model. I'm fairly beginner at park and can tackle basically 95% of terrain at serious mountains. I'm looking to be in the park roughly 40% of the time this season, so I need light skis which can take a beating, but also give me good stability and control on tough terrain.

I'm thinkin about a 900mm waist roughly, and definitely twin tip.

Any suggestions??