Depending on your anticipated setup and the spacing between the posts front to back, you could try to integrate the posts into your theater space. For example, if you plan on having 2 rows of seating you could drywall around the post and position it centered left to right of your seating and slightly in front of the second row (not to the point where it whould inhibit any views) - then mount a projector on the post with a shelf and put the screen on a wall down the room.
We actually selected our house based on the location of the posts and what would work for a dedicated home theater. Our builder limits the number of posts by using a steel beam - we only have 2 in the entire basement (~1,400 sq ft). 1 is in the mechanical room (no issues), the second in integrated into my back side of the back wall of the theater.
Good luck.