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Sorry meant to say he's got a Chromebox and seems to very happy with it so far. He went for the Asus one as he's had bad experiences with Samsung and didn't like the sound of the process required to upgrade it to receive updates (which is crap to be fair, if it's that old it's not a good sign).
The only problem we had was that he said the screen wasn't working, but he just needed to press the button to switch it to HDMI.
Chromebox could be a solution (or Chromebook with a USB docking station to keep the portability and allow docking to keyboard, mouse, monitor, etc).
Have a careful think about what he uses though. Chromebooks are good but there may just be some Windows software that is required and no Chrome alternative, mine couldn't replace a windows pc but is an ideal second laptop. Certain video formats don't play well for instance.
Also, not sure whether an i5 isn't a bit of an overkill. It's not doing much other than running Chrome. My Chromebook is running an ARM processor and copes fine