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NetherYewThat really depends on what you're used to riding. The blanks are traditionally cambered, so you feel pretty much the entire edge. Rockered skis tend to feel a little shorter because less of the edge is in contact with the hard pack. At 5'8 a traditional cambered 180cm ski is going to be a lot of ski for you. That doesn't mean you can't do it, just keep this in mind.
KravtZI rock 180's...the size below 170 is really just to small I think. I could never go back down to a 170 on twin tips again after riding the 180. If your a decent skier go up a size.
NetherYewThat's great that the 180's work for you, but It's all preference. You need your equipment to match how you ski. If you're hard charging, get longer skis. They will be more stable at high speeds, but you loose some of the maneuverability in the park that you would have with shorter skis. You can't have it all, and what you might gain from one thing takes from another area. It's a balancing act. The blanks are park skis, and if you're using them primarily in the park I'd recommend the 170's. If you plan on hauling ass get the 180's, but you WILL feel the whole length of the ski because of its shape.