I'm surprised a lot of people are recommending the X1 Carbon, with little mention of the T-series. The T-series is a favorite among a lot of people I know, and the T460s is very similar to the X1 Carbon, offering a WQHD screen, similar internals, similar battery life, at a lower price point. It's just slightly heavier, but it also has a port for a docking station which the X1 Carbon does not have, if I recall correctly.
For a more low-budget option the Lenovo L-series thinkpads are also pretty cool.