Career move advice required

I've read a lot of posts in this forum about becoming a banker. I'd like to get some advice from ibankers at top-tier I-banks(or any for that matter).
Bottom line, I want to take the appropriate steps, which offer me the best chances, to become an ibanker at a Asian/American/European I-bank

I am trying to switch careers (an IT consultant looking to work for an I-bank) by getting an MBA in Europe/US. I am currently working in India for more than 5years.
My GMAT score is 640 .
Besides Cornell and Insead, what are the other "brand" schools that could help me successfully transition careers from non-finance (IT) to investment banking ?

I'm looking at Cornell,Emory,Oxford and Cambridge primarily, and I think I have good chances getting in there. But, I'm not sure if these schools would offer me the same opportunies (or odds) of navigating this career switch as compared to LBS/Insead? I prefer the 1 year format over 2-year, but I understand this could limit the internship opportunity.
Being a career switcher with 5 years of non financial work experience,i have been trying to learn basics about Ibanking and also got offer to join Swiss Finance Academy for Summer-2008 session.
I however am of the opininon that being a career switcher ,MBA with Finance concentration would be the best solution to my needs.
I look forward to any feedback.

Thanks
Ashish