You must be a big fan of Sc Po and that's OK. But don't try to sell the guy what's untrue. Doing a Sc Po de province is lame and its reputation exists only because of the Parisian Campus.
The brand name of Sc Po might be improving, but we don't care a damn. The thing is Sc Po is good but it's not wow. Of course it's a top schools and you will always be able to get a top job (always slightly below top engineer+ business schools).
And stop bull***ting us, I'm french so don't get tired in explaining how the thing goes. The Sorbonne has the best and the worse. First cycles are just bad (except for the few selective sections: bilicence, magistère). But the 3ème cycles (masters) are incredibly good especially in Law and Finance. May I just remind you that Sc Po is not allowed to deliver law degrees and is seen as a general school (ie, even if it has fantastic economics courses, you won't get specialized education in mathematical finance, econometrics--> the useful stuff if you want to work in the field). And yes, it has a big name outside France and that's how, if you mix it with a Grande école or some other top foreign school (Oxbridge, LSE... the US ivy's of course), you will get the best from both worlds.
For our argentinean friend: aim both, aim as much as you can. But if you get into cambridge, don't even bother considering Sc Po poitiers. If you are really that attracted to Sc Po, you can always go to Sc Po Paris for a masters. This is not mentionning you might want to aim something higher than Sc Po with a Cambridge MML.