I was fortunate enough to be in the Naval reserves while a kid in high school, and was able to use those experiences to great advantage later. I chose to go to the Air Force, and went to the Academy. My brother also was a reservist in high school, but he did it through the Army, and then applied for and received a four year Army ROTC scholarship.
I can only speak of my experinces and observations. I wanted to become a fighter pilot, and then a test pilot, and then an astronaut. One thing I found out is that the needs of the Air Force (insert Navy, Army or Marine Corps here) outweigh the needs of the individual. When comparing the Air Force to the other services, I would say that it is the closest to a normal 9-5 civilian job than the other services - just 2% of the Air Force flies or is in missiles (ICBMs) and the rest go to support them, either directly or indirectly. You just don't go into harm's way as often. My roomate in the academy had a brother that was in the Navy, on a carrier, and he was forever at sea doing WestPacs, always in the Persian Gulf. At the time, we were escorting reflagged Kuwaiti tankers in and out of the gulf, protecting them from Iran. But that's what the Navy does, it fights, keeping the sea lanes of communication open for the world. It's mission is much more global and "real world" than the Air Force's. If that's the way you want to go, I think the Navy is a great choice.
When I was active duty, women were not allowed to be combat pilots, nor were there allowances for women in combat. That changed this week. Prior to Panetta's ruling, the Air Force had more jobs open to women than any other service, followed by the Navy, then Army, and lastly the Marines. Not sure if you want to make a career out of serving or not, but that is something that you'll have to seriously consider. I can say that being at home with my family more often than not was a big reason why the Air Force was a more attractive option for me.
Whichever way you decide to go, I salute you. It's a higher calling, and only a few will truly understand what it means to wear a uniform, and represent your country and all that it stands for. The sacrifices are well worth it though, and I wouldn't trade any of it, especially Uncle Sam picking up the tab of my college education!