Secondary Profession Question

My sin is level 9 and I'm about to pick my secondary, basically my question was how many times can you re-pick your secondary? If it is an unlimited amount of times I can make my choice a little more freely.

I'm thinking either Warrior or Ele or Monk.

P.S. Forum name has a typo :< boo.

Once you choose your secondary, you won't be able to change it UNTIL you get to Senji's corner. After that, it costs you 500g to change to a secondary profession that you haven't used yet. After that, you can freely switch to any secondary you've already used at any time that you're in town.

Senji's isnt very far into the game and sin primarys can function with no secondary so pick anything that sounds good. once you get to senji's you have an unlimited number of changes.