Hi, I don't see a lot of responses in your thread yet, so I wanted to keep this going. I am merely a cadet in college (very frequently referred to by people in the real Army, doing real service, as a "F***ing Cadet"), but expect that when enough people get off work, some helpful information will come your way. I would like to offer what little I know, and others may feel free to jump in and correct me if I say anything that doesn't jive with reality:
First, it sounds like you're a bit confused about officers vs enlisted terms. As an officer, you get a commission, and do not really have an MOS, but a branch, such as Aviation. Warrant officers have a warrant commission, and a lot of people in specialized fields tend to be WO's.
I am not too clear on the route a person such as yourself (degree and then some already) would take to becoming an officer--if that is your goal. This is probably the first thing you should do--determine where your interests and abilities lay, and decide from there whether enlisting or an officer program is better for you. Then apply the particulars of your situation to the best route, as in, "how does a guy with my resume go about being a _________, etc.?"
You sound qualified to do damn near anything in the Army, as long as your back does not give you trouble during PT (lots of sit-ups). I would encourage you to becomes familiar with all your options (all MOS', branches, how a WO differs from enlisted/differs from officer), and visit military.com. It's a web site run by Monster, and I think it does a pretty fair job of teaching people what they are getting into.
Hope this was mildly useful.