I'm in desperate need of a decent computer since my old laptop's screen and battery are dead. My desktop's motherboard is slowly dying as well and its old enough its impossible to find a compatible replacement. So since I'm constantly moving from one place to another I'd rather just have a nice rugged laptop. Any suggestions?

Looking for:
-less than $600
-fairly rugged - won't physically break easily and can take abuse
-14 or 15 inch screen
-decent battery life
-80gb or more hard drive space

I'm not sure what to buy, but I'm not going to buy another HP. I've had the worst experience with them and my current laptop.