At first I was thinking 5inch but now I'm not sure. The 5 inch is smaller yes but it would be a bit of an exaggeration to call it "portable". I can't see myself being able to put it in my jeans pocket or in my shirt breast pocket. So basically I would have to carry it around in my briefcase or shoulder bag, just like I would have to with a 6 inch device. In that case, what's the point in sacrificing readability if you aren't really going to get any more portability?
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