Purdue, Duke, Vanderbilt and so on I would consider B-tier.
I went to a B-tier school. Interestingly, I recently learned that one of my smartest friends only applied to one school (Stanford) and got rejected, and afterward applied to the school I went to because it was only 10 miles away from where he lived.
While we're on the subject, one other thing --
There's a lot of Russians, Indians etc. who recently came here and have poor English, and so a lot of people just look past them. But a lot of them are the most persevering and focused folks you'll ever meet, and in my experiences they learn English quickly enough anyway (considering they got to America before they were 15 years old or so).