So far at CES, Dell has announced that its XPS 13 Ultrabook will finally get a higher-res screen. Now it's shifting its attention to the lower end: the company just refreshed its mainstream Inspiron R line with optional touchscreens and a slimmed-down form factor. All told, the line includes three screen sizes: 14, 15 and 17 inches. Now that they've all gotten a bit of a makeover, the smaller two measure about an inch thick and weigh in at less than five pounds. Still, they're all just thick enough to accommodate a tray-loading optical drive, and the 15R and
