In my 10 year corporate world they have always been IBM/Lenovo thinkpads. And have stood up well from anything the office could throw at it, and then anyplace I needed to bring it in the warehouse, conveyor repair or power plant spaces (but only briefly)
Panasonic toughbooks come with a good reputation, but not sure where the money is - Id imagine they are expensive.
There are 'rugged' and 'semi-rugged' toughbooks as - we have a lot of semi-ruggeds around the power plants and they do hold up well (to dirt, dust, drops etc. The semi-ruggeds arent submersible, but otherwise hold up well.

Do you need help with processor/RAM numbers ? that is a different world ("is a 5th generation i3 better than a 2nd generation i5 ?") that no one here has addressed yet.

-John

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2009 Kia Sedona
2009 Honda Odyssey EX-L
12006 Jetta Pumpe Duse
(insert Mercedes here)

Husband, Father, sometimes friend =)