I would recommend the Asus UL30A - 1.7kg, 13", very long battery life, about 650€ with 4GB RAM, silver color and matte screen. It has also good Linux compatibil

I would recommend the Asus UL30A - 1.7kg, 13", very long battery life, about 650€ with 4GB RAM, silver color and matte screen. It has also good Linux compatibility. The display could be better, but I have yet to find a notebook screen with which I'm content.