Request for Profile Evaluation

Hi Experts,

While researching on web, I found your convincing and sensible advice in terms of profile evaluation.
I need your help and support for the same.

Whenever I think of pursuing mba, the two words that flow in my mind are- WHY MBA?
My honest answer to the above question is:
1. For Leveraging the career growth rate
2. Switching my domain of IT Telecom to Finance and Energy (decision purely driven by my interest)
3. Last but not the least, MBA provides the knowledge to visualize the world in completely different way (in an intellectual and much sensible manner)

After self studying for GMAT, I finally took the test:
640: Q49 V28

Here is my brief background with my accomplishments:

Education
10th 85.8%
12th 83.8%
Bachelor's 68.3% (top 10 in class)
Professional experience of 61 months ( as on 30th NOV)
ITIL V3 Foundation Certification- Certified by Office of Government Commerce OGC, UK June 2011
Table Tennis Championship Runners-up (State Level) and 3 times participation at State level
Crafted Whitepaper published on the website of Telecom Management forum
Managed process Architecture for developing my organization's capability
Experience with NGO (4 months) teaching poor children.
Star Performance Award and Outperformance Award during my professional experience

I really want to join an MBA program (in 2013) a 1yr course (not more than 18 months), in banking finance or energy domain . I have been working with one of the Telecom giant in an analyst position, which is more of a functional role within IT.
Moreover, I believe that I wouldn't be able to retake my GMAT as I'm working fulltime and in tight schedule.
The worst thing is that I lack knowledge about the B-schools
However, based on my research I have finalized few colleges:

Great Lakes Institute, Chennai India
ISB (Indian School of Business) Hyderabad, India
National University of Singapore
Nanyang Business School and
The University of Hong Kong

Recommendations shouldn't be a problem for me.
I love to work with calculations and will prefer any related course as interest drives me.
Sorry to be so long-winded. I appreciate any advice on the schools to consider.
Thanks!

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