What is durability? Keep in mind that the batteries tend to fade out in 18 to 24 months. Another poster wanted the laptop to take "abuse". That said, I've yet to see the makes you listed not get 3 plus years of use at the office. But the batteries are often 15 minute wonders by then.

As to usability, they all run the same OS so they all look and act pretty much the same. Can you supply an example of where such fails usuability?

Since you are leaving the country you bought it in, you'll want one with an international service network. HP and IBM gets my nod for this.

Hope this helps and in closing... Your question is very much like others in this forum. Have you read them?

Bob