help parsing good reasons for business school from bad ones (longwinded)

I was hoping for some sage ol' advice on my business school prospects, especially with regard to the calculus behind my not-totally-developed MBA ambitions.

I have an Economics BA from a pretty strong undergrad Econ program (Berkeley) and am becoming more and more sure that my future career will be 'business'-oriented in one way or another (versus law, academia, military...other fields I've considered). Honestly, there isn't any one post-MBA field I'm particularly intent on pursuing at this time. I'm conversant in most fields an MBA would lead to, what between a fiancee who works in finance and various college friends I've kept in touch with as they've embarked on their career paths. Since graduation in 2010, I've served as a lieutenant in the Marines. Getting out at the beginning of 2014 is beginning to come into focus and so is the transition that will come with it. Business school seems to make sense, but I'd love for someone to critique my expectations, assumptions, and aspirations. Namely:

-Are my career aspirations too vague to warrant the serious commitment and financial outlay (well, possible outlay...more on that later) that would accompany business school. The best I can do is to say that I think I'd gravitate toward consulting or general management. Is business school ever an appropriate place to figure out what you want to do with your life?
-Business school woud provide me a portal into the recruiting process that I'm not sure I could access immediately out of the service. I'm stationed at a pretty provincial post for the duration of my present contract.
-Going back to school in and of itself is awfully inviting. After these last couple years of deploying to Afghanistan, working up for deploying, and going off to the deserts of the Southwest for months at a time for further training all while only being able to be with my fiancee a few weekends a month has me a little tired. Even the most rigorous program seems like it would be an improved lifestyle. That this consideration is always prominent in my mind sort of troubles me.
-I can get a great deal at some programs: if admitted, Ross and Johnson would both be full rides with a roughly $2,000/mo living stipend (thanks, taxpayer!), while Tuck and Kellogg also offer generous aid for veterans. The latter two would probably result in well less than $50k in expenditure.
-Am I possibly short-selling myself with the consideration above? How flawed is it for cost to be a relevant factor if admission to more target schools is viable?

That last point lets me segue into the inevitable 'what are my chances' part of the post (I actually posted this question a couple years ago right out of school...but now it's a lot more real and my resume is better-rounded). My admissions profile, as accurate and sober as I can get it:

Academic: BA Econ from UC Berkeley. My upper division GPA was 3.4, my lower division GPA from a community college was 3.9, resulting in a cumulative GPA of a little over 3.6. The community college portion of my resume is a hindrance, but it also sets up essay opportunities, as it reflects my somewhat humble backgrond. I grew up pretty working class and paid my way through college working as a logger in Northern California (sounds a little corny, but it's true...both my dad and grandpa are/were lifelong loggers). I was salutatorian of my small high school class, but college just wasn't a big deal in the prevalent culture of the small mill towns and cities I grew up in. I only figured out what kind of opportunities I had once I started community college. Don't intend to take the GMAT until next year (not helpful, I know), but I reasonably expect something in the low 700s after some earnest prep.

Career: 4 years service as a commissioned officer in the Marine Corps. In all honesty, my military career hasn't necessarily been all that auspicious. I'm an air defense artillery officer (Stinger missiles) but have deployed in the capacity of a drone controller. I have some good fitness reports (Marine Corps performance assessments) and some middling ones. The language of these reports tends toward inscrutability in the eyes of civilians (even non-USMC/Navy military types), so I don't place a lot of import in them in terms of their usefulness for admissions. I've done a solid enough job as a junior officer, but there's no key accomplishment that will set me apart from other military applicants.

References: from work, one or two good ones from immediate supervisors (captains). one from a graduate student instructor in Cal's Econ department, one from a Cal humanities professor. This is a weaker spot for me. I was in a big major at a big school and already had a job secured by the beginning of my senior year...so I short-sightedly didn't pursue references to the extent I should have.

Extra-curriculars: There's prospect for some of my writing (I guess you'd call it 'literary non-fiction') being published in a minor literary journal or two. As a hobby, I'm becoming involved in some historic architecture preservation projects. I do some competitive distance running, as well. My interests are broad, and I'm affable and confident enough to interview well, I think.

So, in addition to scrutinizing my motives for business school, what schools do you think are in play? I'm as ambitious as the next guy and in some sense would like to place myself as high as possible, but I don't necessarily have the perspective to compare the merits of a free MBA from Ross against a partially out-of-pocket MBA from, say, Wharton. And, honestly, I don't want to come off as presumptuous in my discussion of a school like Ross as a prospect; it's less a baseline than somewhere I think my undergraduate background lines up with well. Thanks in advance.