Vaio and Alienware laptops has yet to let me down. My Vaio lasted a really long time and didn't lag as much as the laptop I have now does, and my Vaio was from back in 2000. Alienware laptop was a beast... but your pockets really pay for what you get.

And don't get a Dell... I'm using one right now and I hate it. Unless perhaps it's an XPS. I've heard good things about those. I'm using an Inspiron right now. Don't like it much... had it for a little more than a year and I feel it's time I get another one already.