I have an MBA from a b-school ranked ~35...finished 2 years ago. I worked for 7 years after my undergrad then went back and did it. I should note that my field is engineering and NOT banking/IB and perceptions there can be different. Here are my thoughts:
-I went mostly for both the academic stimulation and for the promotional potential. In that regard it got me both, it was an enriching program where I met alot of great people, many of whom are still good friends, and I got a promo/salary bump when I was done. I'd say it was worth it.
-I cash flow'ed my degree from savings/income, I'd say this is preferable to loans but it depends what financing terms you can secure.
-Unless you want to score a premier job, the ranking of the b-school is of small consequence. Wall Street IBs will usually only hire from the top 5-10 types...HBS/Booth/Wharton/Kellogg...everyone knows the list. I'd agree with one of the other posters that if you are trying to get on with a premier company and expect 200k out the gate after an MBA, the premium for these schools might be worth it and may be the only way you will get your foot in the door and secure one of those type jobs. For the vast majority of us that just want to progress our careers, any top 50 type program with a good reputation is more than adequate.
-There is still a mixed perception about the online only type business schools. Some people dont mind them, some people find them inferior. No comment here except to say i dont think i could have had as good an experience as i did with an online only program. My program did tons of teamwork, presentations, etc that help me in my job every day.
-There were plenty of bankers and investment advisors in my program from most of the major national bank and investment management companies...WF, BA, meryll lynch, jpm/chase. For the most part they all seemed happy with their school choice and the opportunities it opened. Then again none of them tried to/expected to go work in HQ on wall street either. So to recap i'd say, if you're looking to get a couple rungs up the ladder to a regional manager type gig go to whatever decent school you want. If you're trying to get to the c-suite it will pay to go the best school you possibly can, but only if it's a top 5-10 school. There is very little difference between schools ~11-25, at least in perception.