I would ask Joe just to play it safe, which is what I did, and my wide/long bag fits me great. There is some extra room for layers, like a sweater and windbreaker (which I have slept in with this bag and it was great). Seeing as we are the same height, my guess would be that the long is your best choice, but not sure about the wide, as I weigh roughly 35-40lbs more than you.
I love my Zpacks sleeping bag. In a few years I will replace my 3 season bag (Marmot Plasma 30) with a Zpacks bag for sure.