Hi Sam,
Best of luck - you're in the right place if you want an MBA - the help on here is staggeringly good and everyone is a really great bunch. I couldn't have got through my GMAT without the support on here.
You're right that MIT seems to be the best for Supply Chain/Ops - it seems to be the only Top 10 program to me with a real emphasis on Supply Chain (and of course the MIT name will give it weight in that area). I think Stanford and Wharton are also strong as well in the top tier. I haven't done enough research to know much about lower down though.
I'm based in Europe and I can tell you its pretty slim pickings over here for Operations. I've been to a few MBA fairs and it seems very finance/consulting-based, especially in the best schools.
All the best - we've got similar backgrounds so might be competing come September!