Non-Catholic college recommendations?

I have twins who are juniors this year, thinking about where to apply to college. They are serious Catholics, interested in the humanities, and very bright. We've got a decent list of Catholic schools, but are alo looking for non-Catholic schools where a student with very high SATs will have intellectual peers, but where her Catholicism won't make her an outcast--or better yet where she can find congenial fellow Catholics.

Some places we've considered are Princeton, Chicago, St John's College.

I'd be more than grateful to hear anyone else's experience with any these, or suggestions of other places we should look at!

Thanks
Anne-Marie