p.s. i've also been hit by a car with the bag on my back and the computer was perfectly fine after. 
Hey guys idk if this is anyones "style" but the http://www.ebags.com/burton/the_white_collection_pack/product_detail/index.cfm?modelid=95922
this burtun bag has nice laptop compartmen and a lotta book room it seems
dakine makes some cool backpacks that have notebook sleves, i have been using one for about 2 years now and love it, they take alot of abuse and pad the laptop well. has held up to 2 snowboarding seasons also, so it takes abuse of all types, its also extremely water resistant, as long as you dont submerse it in water your stuff will stay dry.
http://www.dakine.com/street-series/guys/packs/
Hey guys idk if this is anyones "style" but the http://www.ebags.com/burton/the_white_collection_pack/product_detail/index.cfm?modelid=95922
this burtun bag has nice laptop compartmen and a lotta book room it seems