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IMO if your looking for a pure park ski that will be used pretty much for jumps only I would suggest a fully cambered ski and something with a medium - stiff flex. A lot of it is probably personal opinion, but i do truly believe that a full cambered ski, particularly for jumps, is the only way to go, they have better carving off lips and generally more stable on landings.
The other question is whether you want a symmetrical or directional ski.
Some great skis to look into would be - Symmetrical: Volkl Wall, Moment Reno Jib, Atomic Punx (Punx is on the softer side). Directional: Rossi S4, Armada ar7
I have owned the s4 and friggen love them and have skiied the ar7 and the wall and they are all pretty damn good skis (s4 is a stiffest of those 3). Also I havnt used schitzo's before but I have heard they are heavy and not very durable.