Ok So I didn't read much past the first round of posts but here is my input.
Go STR as your Main stat, Con afterwards. You will be hit. The Idea is to hit them hard enough and fast enough to make your AC less of a concern. You can use your Monk bonus feats to pick up Deflect Arrows and have yourself a once a turn ranged attack negation. Covers having lower AC from distance.
WIS is nice...but you don't really need it too much. Considering how many stunning fists the Monk has per day you could honestly go for a lower DC since you can always flurry and attach Stunning Fists almost as an afterthought, nice if they fail the save, but the consistent damage is more important. Ki is also nice and having it is good, but with a 15 point buy, STR is your Reliable stat.
Power attack is a thing. You should consider using it whenever you can reliably hit. Shuriken, Flurry and Deadly Aim = your only real ranged option 1D2+9 = win! I am assuming your using Core only, so I will refrain from suggesting Dragon Style...If you do have access though, Dragon Style and Power Attack will eat through most DR.