I am 5"9 about 155 and i have a pair of the 2014/2015 SFBs in the 172. They are my first new ski in a couple of years but I prefer my skis a bit on the shorter side because I find them more nimble. I just got off a pair of 2013 Ar7s at 161 just because I wanted a wider ski to go up against the West Coast powder. You should be fine with the 172 Bacons and worst comes to worst, you just resell them. I had a hell of a tough time finding a pair for under $400 and there are a bunch of pairs left in the longer lengths for cheaper than that so you should be fine.
"Haters hate me like alarm clocks on morning Mondays" - Skiz
What is the meaning of life you may ask? Boobs, Butts, and Skiing.
You ever think about what happens when you send your skis to get mounted? Some random guy is there doing fucked up stuff to them. He's caressing them and then straight up drilling them hard and keeps on screwing until he's finished. And when your skis come out, they are no longer virgins.