I think you are failing to consider a really important aspect, that is the length of the program. LSE is a one year program, whilst HEC is two-year (IE I gather it's one as well?). Having a two year program allows you to apply comfortably for internships, which is the easiest way to get into an IB graduate program. Without a top internship it is difficult (albeit not impossible) to make it to a grad program.
In terms of reputation, it really depends how you look a it. In terms of MBA - ie. top masters-, it would be IE>HEC>LSE, whilst for graduate studies it's HEC(if you're in the Grand Ecole program)>LSE>IE. If, as it is your case, you are not in the über-competitive Grand Ecole program, HEC and LSE are pretty much tied.
However, there is a crucial difference: HEC and IE are business schools, LSE is not. LSE is a university in the most strict of terms and is very academic. IE and HEC are much more practical and focus much more on developing skills sets that will be useful in your career. Depends what you want to get out of your masters. One last thing is that IE's Finance masters is CFA accredited, whilst I believe the other two are not - which would come in extremely handy if you want to tilt towards Asset Management or M&A.
In terms of recruiting, all three are really good. LSE's masters is not really banking biased but in the end it's not your master's what will get you a job, it's your perfomance during the assessment process. HEC has crazy recruitment fairs on par with LSE and IE has a network of contacts and alumni in top positions through it's MBA that dwarfs the other two: HEC is king of the road in France and in many Trading/Quant positions in IB's in London and LSE is very strong in the UK but both are relatively weak outside their home countries. IE on the other hand has a stronger foothold in a wider array of nations.
I would think about it mate. You have a really good set of offers in front of you.