I'd say you are like a friend of mine who has killed numerous Macbooks, since v1.0. He always uses his machine to the maximum - number of applications, jammed hard drive, lots of media content, used in a mobile state 16+ hours a day, etc. He's had numerous issues with them because he uses them heavily and they are a lightweight machine. And every year or so, when the latest one is in its death throws, he buys a new Macbook, but never the Macbook Pro - the extra robustness of which, might just save him a lot of grief. If you do nothing else, make sure everything is backed up, then nuke and pave it. Good Luck!