My advice is not to run for any of those positions. I think the SBA is a waste of time. SBA officers are known throughout many law school communities as being useless blowhards.
Remember what you thought of the people on student council? This is just like that. There are other, better resume builders around.
I hate science because I refuse to assume that a discipline based in large part on the continual scrapping and renewal of ideas is unconditionally correct in a given area.