M0nkeys, you REALLY need to do some significant research. Based on your original post, it is clear that you haven't looked into membership closely enough. I'm not saying this to be mean--I'm speaking from experience and you need to understand that this is a serious undertaking.
You really need to pick ONE organization that is your TOP CHOICE and ONLY CHOICE after doing research. Research includes talking to members on your campus and other campuses, participating in their events that are open to the community, and learning all you can. This is a lifetime committment for most organizations, so you really need to be sure you are pursuing membership in the organization that is not only best for you, but that you can best contribute to. Good luck to you!