This is kind of important. For park skis, I would recommend -K2 Domain or Maiden in 179 (it measures to around 181, and others will back this up)
-ON3P Filthy Rich. Don't know a ton about them but people seem to like them
-Line Chronic 2013. Now with a small amount of rocker, seems to be really similar to the K2 Maiden. The Blend is also a possibility. There are a few people who slay those in the park.
Those are a couple that I know about from personal experience or multiple good review from others. The Rossis someone recommended seem good as well.
Just remember that rocker skis short because it cuts down on your effective edge. If you're thinking of 181 based on normal camber skis, start thinking longer. Hope this helps.