Well, I have my happy little Compaq laptop which is one of HP's sub-brands and I can say without a doubt in the 2 years I've had this I've knocked it over -alot-, just yesterday I knocked it off the sofa into the table then onto the floor and it still loves me!
My only issue is their power cords suck. My original one got all jacked up 3 months ago, I bought a new one and it's already starting to die, and thanks to me overusing this my battery is basically nothing.

I can say though that it's been a good computer for basically everything.

My sisters had two dells so far, one got killed by a virus my computer-illiterate bro-in-law got in it, and the other one's been doing well and she drops it alot, not to mention she has a 9 year old who plays on it and a 3 year old who tends to hit at it or try to shut the lid when people are playing on it.

Since your last one died of being knocked over you should really prolly look into one that's can handle being knocked over, like my compaq or my sisters Dell. Trust me, we don't treat our compy's with love, but they still love us!