University of Massachusetts Amherst is a top school for Linguistics. Their strong program in Psychology can be supplemented by courses at neighboring Amherst College, which is very strong in Psychology. Cross registration for UMass students is available at Amherst.
Connecticut College is a small liberal arts college which is strong in foreign languages and where Psychology is a very popular major. In addition to offering a major in German, they offer a minor in Linguistics. You would probably be competitive for a merit scholarship there.