I could see them hitting New York, but New Jersey is a waste of a good nuke, too close to NY. The places I have always thought were NY, Boston, Atlanta, L.A., San Francisco, Seattle/Tacoma, and maybe Chicago. They would want an area where the fallout will maximize exposure. That rules out Miami and places in Florida, and places like Denver, Salt Lake City, Albaqurque, Pheonix, Tucson, and Las Vegas. While these places in the desert would seem like likely targets, with big populations, there is low population in the surrounding area.
Just my $.02 worth