I chose Warwick over Cornell and Northwestern...because the specific course was ranked very well at warwick (Econ, no. 2 in england, this year no. 3), which is obv better than Cornell's econ program. Cornell's an excellent institution, esp for engineering and the sciences, but less so for economics. Northwestern is probably on par with warwick for econ. So as u can probably figure from my post, it all depends on the subject. And UCL in the UK would probably be on par with Brown and Cornell in the States. HYPSM = Oxbridge, but the advantage would be these is that they are well renowned worldwide as unis in general.