I applied to H/S/C/MIT too (with varying degrees of success).
Firstly, I would say try and nail the GMAT which is going to be important for the very top schools.
Once the GMAT is out of the way, I think stats wise you will have a shot at the top schools but it is very important you craft compelling essays for the adcom - showing how your past experiences tie in with your future career goals and how the MBA is "the bridge" for making this happen.
The international experience is great (and would make a good Booth slide!)
Once you start working on your apps I am sure you will cut down on the number of schools you are thinking of applying to........as you will be absolutely burnt out trying to craft 5 perfect applications for Round 1 then more for Round 2. Remember you will have to great recommendations for each app too.
MIT, Booth, HBS, Stanford