Advice on an Officer MOS?

[Ferratus]

As helpful as everyone's response was to Ross' post concerning college majors, I thought a few of you would have some thoughts on this question. It is really a three-part question that has to do with Ranger school as well, a subject I'm sure many users here are all too familiar with.

As former or current SF team members:

1.) Which Officer MOS do you feel would provide the greatest experience necessary to operate as an 18A? More specifically, would working in something like the Intelligence or Medical branches give more useful training than in the Infantry branch?

2.) Since it seems as though there are more applicants for an 18-A than there are open slots, is there an MOS that would increase my chances to be later selected for SFAS?

3.) Is Ranger School still an option for non-Combat Arms officers?

As a sidenote, I'd just like to extend my gratitude for those who have responded to this forum. While there seems to be ample information concerning the NCO SF MOS, it has been exceedingly difficult to find a good source of discussion about pursuing a military career as an 18A. If anyone can recommend any good books or websites that address this topic, I would be in your debt.