IBMIBMIBM. ... eye - bee - M makes the most durable notebooks. But they are more pricey than your Dell's. Toshiba is a good one, i have 2 friends with them and they are seem to like them.
Just remember... stay away from your big 'kitchen sink laptops'. Ya its nice it has a '9600ati' card in it but your not going to want to tote that thing around a year from now. You want it to be as little and light as possible. And Buy an extra battery, and remove a floppy so you will actually get the quoted battery life. They like to fool you with that one.
I hate to say the word but a fruit company make a nice laptop too.