I would definitely go 184. At that weight it will be a much more stable ski, especially when skied at speed. Also if you are an aggressive skier it will pay off to have more ski. It might take a few days to get used to the extra length, but in the long run it will make you a better skier. If you are wanting to use it as an all mountain ski it will perform better when longer. However, If you ride rails, and only rails, go shorter.