RUGBY! Here is why:
1) It isn't an NCAA sport, so all college programs are walk-ons with 100% acceptance so long as you attend practices and workouts, but many of the high profile teams also have a coaching staff and compete regionally.
2) This should be #1, 2, and 3 - RUGBY IS AWESOME.
3) RUGBY IS COMING BACK TO THE OLYMPICS! If you start playing Rugby now in college, you could put yourself in a position to be on the Olympic team! Fun Fact: The one and only time Rugby was an Olympic sport, the United States won GOLD!