It depends on what you like, and I'm sure some people will come here telling about PKB and FA. So, I'm going to post the skill build for my Huntress to be.
lvl30: +1 Bow Booster
lvl31: +3 Bow Booster
lvl32: +1 Bow Booster, +2 Soul Arrow
lvl33-38: +18 Bow Mastery
lvl39: +2 Bow Mastery, +1 Arrow Bomb
lvl40-48: +27 Arrow Bomb
lvl50: +2 Arrow Bomb, +1 PKB
lvl51-55: +18 PKB
lvl56: +1 PKB, +2 Soul Arrow
lvl57-61: +15 Bow Booster
lvl62-66: +15 Soul Arrow
lvl67: +1 Soul Arrow, + 2 Focus
lvl68-70: +9 Focus
This build is a FAless build, the only thing different is that you get some early points in Bow Booster and Soul Arrow to forget of buying arrow ASAP.
PS: sorry of it's messy, can't figure a way of making it look better.