Well, I for one think that the best Ubuntu laptops are System76. The customer service is outstanding, everything works out of the box and you have 3 different models to choose from and configure the specs at your personal taste. Quality/price is the best out there. Try to find the same specs for same price with other major vendors (dell, HP, etc...).
I am a proud owner of a System76 system and can truly tell you that you won't be disappointed. I am actually thinking in buying my second device (a 14' laptop for travelling).
Hope this is what you are looking for. They have a support forum if you have doubts and their support staff is very active there.