I'm just under 6'  I pick skis more based on weight and stiffness than length.  I have a pair of 171, 168, 145, and I forget how long my 04 rossis are. tallest ski I own.  general rule of thumb for park is lips is good height.  racing GS just above head, bumps = chin, powder = fat and just above head.
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Ice, snow, man-made, slush, powder, as long as u land on your feet nothing else matters
lates moe