l am 5'9, 170lbs, intermediate skier.l like most all terrain except for moguls.

It really depends on your level of skill. A good rule of thumb is the longer, the faster.

While what the previous answer said is correct, speed should not be acchieved at the expense of everything else. While the type of ski depends a lot on the type of skiing u want to do, whether it be powder, off-piste, free-style, racing, or moguls, the length of the ski only differs the most in racing. l am an avid racer, however enjoy all round skiing very much. A good rule of thumb for the intermediate skiier around my height as well, would be right around chin tall. Something in the range of 160 would work the best. If u have any questions about the type of ski or brand, l would be happy to help u there as well