[ubuntu] Looking to buy a laptop and want Ubuntu!

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http://ubuntuforums.org – Hey Gang... I'm one of many Ubuntu users out here and enjoying it on my desktop computer. But now I got a few extra bucks in my pocket and want to pick up a laptop for travel reason for the RV. But 99% of everything comes with windows. What I want to know is there any laptop to watch for or hardware to watch for that doesn't work with Ubuntu? I know there is System 76 for laptops too but I can do a bit better in price I think. So what out there for laptop information I got to watch for? :confused: (Hardware)