Hammer fist isn't worth upgrading. Master 1 is about 10 damage more than the app4 version, the debuff end doesn't change at all. If going pure DPS, go this route:
Roundhouse
Crushing Fury
Savage Blows
Bone Crusher
Crusher
Dirty Punch
then whichever order you want with the rest.
If you've only got so much money to spend, do the order i posted up top. That is a very economic list of the skills worth upgrading. If you still aren't sure, use your gut instinct to choose.
I gotta make a list of adept 3s and master 1's sometime soon... Give me a week or three, I'm a busy guy