If you like the beach, somewhere down the end of the Monmouth line. Mountains end of Morristown, Bergen or Pascack lines. Northeast goes to Princeton. Expensive suburbs like Summit, Short Hills, Milburn. Nice suburbs out from there. Bergen County has classic upper/middle America. Essex more like city fringe. This is a big city that covers a lot of space.

Its worth saying the trains a slow and infrequent compared to UK so JC is actually pretty good. :)