I just got a Dell Inspiron N5050 laptop (not from the US) that came pre-loaded with Ubuntu some time ago, and I have to say -- the Linux support is astounding.
Absolutely everything works. The integrated webcam, closing the lid putting it to sleep, the various built-in keyboard keys (for changing brightness, volume, ..), et cetra.
Can't say how happy I am with it. And it only cost $450. The specs are: Core i3-2570, 8GB DDR3, 320GB HDD, Intel HD 3000 Graphics (no discrete). The laptop looks and feels nice too.