Please don't get too hung up on the rankings. You can easily find ways in which the #10-ranked school is better than the #1-ranked school. A lot of applicants don't really listen this advice, but definitely do not base your decision on the rankings. We advise that people just use them as a starting point when trying to figure out what schools they might want to apply to. The rest of the research (and the final decision) is up to you.
To answer your other question, there are absolutely no guarantees in terms of getting a job after getting ou tof a top-30 school, especially in a slow economy. It really depends on you -- how string your background is, how well you research companies and make contacts within those companies, etc. -- more than anything. As school will help you in that its reputation helps and companies will come and recruit on campus, but the rest is up to you. I'd focus less on those "number of people employed" percentages and more on seeing the list of companies that recruit at the school. That's a good measure of what you job prospects might be in the field that you want to pursue.
Scott
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Co-Author, Your MBA Game Plan