LSE, Warwick and Oxford are quite popular in the IBanking circles in Europe and in Asia (Manila, Hong Kong, Singapore, Dubai, Shanghai, India).
Okay, I've done some research about MS in Finance or MSc in Finance or MSc in Financial Mathematics or Financial Engineering and the top schools that repeatedly come out at the top of the league are: Oxford, Berkeley and LBS. Aside from the top 3 schools I have mentioned above, I would also consider Stanford and MIT (US) and Warwick and LSE (UK) if I were to take up graduate level Finance.
The average GMAT score at Oxford is
730 while its only 690 at Berkeley. Warwick does not require GMAT. The average age at Oxford is 24 and 28 at Warwick.
In terms of career progression, Berkeley has the best record in the US and Oxford in the UK.
If you want to work in the US, I suggest you go to schools in the US. If you want to work in Europe or in Asia, British schools are excellent bets. If you can get into Oxford, you should rather go there. But Berkeley is also quite tempting.
Oxford -
Oxford Saïd Business School: Welcome to the Oxford MSc in Financial Economics
UC Berkeley -
MFE Prospective - MFE Home - Haas School of Business
LBS -
Masters in Finance: London Business School, Programmes - Masters (MSc) in Finance at London Business School
Warwick -
WBS :: Masters Portfolio