VoyagerII
If you go to a top 15 school, the H1b visa is not an issue. You will will get. It is not as tough as some comments above indicate. Plus in the long run, the top 15 schools will give you all the mobility you want, since most of the top firms here have huge international operations.
When everything is said and done, if the school is a top 15, the H1b visa should not be an issue. Further, for your prospective schools, check out their international student placements rates....that should tell you all you need.
Agreed with your view regarding mobility...however, with the lottery system, everyone is at par...whether he / she is a graduate of the no.1 B school or the no.100 B school. Getting a sponsorship is not difficult if one is from one of the top B schools; however, whether the person is able to stay in the US or not depends upon his/her winning in the lottery i.e. it is purely luck based