Mainstream 13-inch workbook. You don't have to spend over $1000 USD for a portable 13-inch notebook. These options may not look as pretty as the XPS 13 or Spectre series, but they have just enough features to get the job done.
http://www.notebookcheck.net/Face-Off-Asus-X302UV-vs-HP-Envy-13-vs-Lenovo-IdeaPad-710S.179064.0.html