As above, I'd go for the Panasonic Toughbook CF-31 Performance Model! (The most recent version - more durable than ever!)
http://www.realwire.com/release_deta...eleaseID=18625
It may cost a pretty penny... but you could store it in a bag made of over-ripe pears, and all that would change, would be that it is now a pear-smelling, but still fully-functional laptop!