depends on weight more than height. If you are from like 100-125 lbs, go with 155s. if you are about 130 to 150, then like 165cm. If you are 150-175 go with something in the 170s. very rough guide, but at least it gives you some idea.
a jib ski should be ur skis that are so beaten and trashed that they cant ski snow but only on cemment, thats how u find a jib ski. u dont go buy it just comes to u sometime sooner or later