I'm five-foot-seven, about 150 pounds, and a 130 flex boot (K2 Spyne 130) works well for me. As stated by others, though, the fit is most important. A well fitted, softer flexing boot will almost always perform better than a poorly fitted, stiffer boot. As others have stated, go to a shop and try the boots on and make sure they'll fit you before buying. Most shops will price match for you, if you find a better deal online, so there's little risk involved in buying a boot from a store. Personally, I'd pay more for a boot I could try on first, anyway. As a side note that may or may not be applicable to you: I keep an old pair of 100 flex boots around that I use for a handful of ski days during the early season, until I get my ski legs back. Also, also, I know a fair amount of skiers that charge hard in softer boots (usually around 110, so soft by some folks' standards, probably not all). So, do with that as you will. Best of luck with your boots.