That depends on what you plan on using them for. I'm 5'8" and I have last years 186s (the only size they made) and they're completely fine for me based on what I do with them (they're my go to powder/fresh snow ski...I live in the east so we don't get a ton of powder, but I do make some trips to Utah and I use them there when I go, I also use them for random all-mountain days). They rip, and I've taken them off some jumps, they're a bit slower spinning, but still a ton of fun. If you're looking for a bc-booter/side-country/all-mountain ski, I'd go with at least 181 and probably greatly consider the 186, in fact if you think you can handle them I'd go with the 186 (unless you want to use them in the park more than anywhere else...)