Straight post or Freeride post will work. '08 and '09 have to be changed to one or the other. Not sure on '10 XP. I believe '11 and up you can leave stock post.
For guys cutting and adding a straight section. Move your tie rod mounting holes while you are at it to the newer post position. If I remember correctly it is 10mm closer to the post. Makes steering easier.
Does the Freeride post have the new mounting hole locations you are talking about?