If I understand correctly, you want to know if you stand a good chance at a top US school. Based on the info you gave me, the no-BS answer is probably "no."
However, I do not believe that I have a complete picture. So I do have some questions.
Did you finish your Masters program? If not, will you finish? When?
What did you do from the end of 2008 to the beginning of 2010? Was it all travel? Did you volunteer? Develop your skills in any sort of meaningful way? How far did you get with respect to your b-plan? I know you quit on your own free will, but why?
The work experience you do have is excellent. I am very familiar with Macquarie. I have several friends who work or have worked there and they all describe a very formative, tough and possibly rewarding work culture.
Right now, the picture you are painting is of a person who can't finish ... a smart guy who is well meaning and can make an impact, but won't deliver in the 4th quarter. There are a lot of zigs and zags - whether or not you can punch the ball into the end zone is important because the adcom needs to know you are not grasping at straws. That is, b-school is a planned and pre-meditated venture, not an escape hatch. Now I might be off with how you execute in the real-world, but on your app, do not let perception become the reality.
I would look to business schools in Asia. I am a particular fan of NUS, INSEAD (Singapore) and HKUST. Also, you are going to need all the help you can w.r.t your GMAT score. Come through in the clutch and crush the exam.
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