Speaking as someone that also has a GMAT of 740, and acceptances to a couple of the schools that you have so far mentioned, I would re-iterate that the GMAT is only really a hurdle to jump over in terms of getting the rest of your application (ie essays) looked at seriously. 740 alone won't get you in, but a low score will ensure you don't get in. You need to write compelling essays as to why you want an MBA, why now, why that paricular school, what you will contribute to class, what you hope to get out of the experience, and make the whole application flow so that it is coherent and makes complete sense to adcoms. In your essays you also need to demonstrate your leadership potential, ambition, and all the other soft skills that b-schools value so highly.I have spent the last few weeks talking to people in my incoming class, many of whom have scores less than 700. However, they all have very compelling and interesting stories to tell, and the education and work experience to back it up. Most have worked all round the World and speak 2-3 languages too.I agree that a 2 year course would be better for a career changer, though INSEAD will be more than adequate to get you in as long as you are good enough yourself.