I like the 15.6 inch Toshiba Satelitte 665 line. I have an i3 A665, my mother has a dual core AMD C665, and my uncle has an i3 C665.
They all have easily replaceable hard drives, RAM, and even keyboards. My mom's C665 was vomited on by one of the kids she watches and I was able to buy a replacement keyboard for 10$ on eBay and replace it without even opening the machine. It has a plastic strip above the keyboard that covers two screws. Unscrew them, disconnect ribbon cable, replace. My uncle has dropped his on his concrete floor in his basement multiple times, still works. Mine still works great as well, but I've never dropped or spilled anything on it.
Working computer retail/warehouse for the last five years has taught me that most brands of laptops are garbage. HPs, Acer/Gateway/eMachines, MSIs, Samsungs, Dells, Fujitsus... Lenovos are either really unreliable or really reliable, no in between. Apples are reliable but overpriced and proprietary as fuck. Asus, Sony/Vaio, and Toshiba are the most reliable in my anecdotal experience, by far. I swear there are some HP models we get returned almost 1:1. Don't ever buy an HP DV6000.