[mathgrad]

Fayfay:
If you are interested in Number Theory(either Algebraic or Analytic),you should definitely NOT go to Michigan.Almost the whole NT faculty(Brian Conrad and Soundararajan have left for Stanford,Skinner has left for Princeton and Wooley for Bristol and Gopal Prasad is going to retire in a few years) has left Michigan.If you are interested in the elementary Number Theory,there is Lagarias and Hugh Montogomery there.But if you are interested in Algebraic Geometry,Michigan is very good and a better option than Berkeley with Fulton,Dolgachev,..........Because of the high (students:faculty) ratio in Berkeley and also because of the growing inactivity of majority of faculty members there,I have heard that every student interested in Algebra-oriented student somehow tries to get under Poonen and in the recent past,under Martin Ossolon.Ribet has turned 60 and Eisenbud is going to retire next year from Berkeley.So for any modern kind of Number Theory(NT),Michigan is hopeless and Bekeley is OK(you must perform well in the first two years to get the supervisor of your choice,remember,make sure that you are not compelled to choose another field because of lack of active NTists there ).Nowadays,hardly anybody does research in Pure Algebra,it's usually used as a tool in other fields,but I guess you know that too.
So,to summarize,if you are Number Theory-oriented,go to Berkeley and if you are Algebraic Geometry-oriented,go to Michigan.