I just shell out for the thinkpad. Have a new carbon x1 on the way and I can't wait to get my hands on it. Yes it is twice the cost, but there are things to cheap out on and the things you use every day shouldn't be one of them.
http://shop.lenovo.com/us/en/laptops/thinkpad/x-series/x1-ca...
https://www.asus.com/us/Commercial_Notebook/ASUSPRO_ADVANCED...
http://www.notebookcheck.net/Asus-ASUSPRO-Advanced-BU201LA-D...