I've been trying out the new Dell XPS 13 and liking it so far. It is probably the best Windows Ultrabook around. I love the 3200x1800 InfinityEdge screen and the slim 11-icn form factor.
The other item is my hand is a 12,000mAh Dell Power Companion battery that can charge your USB devices or the XPS 13 itself.
My model is the Quad HD+ display with touchscreen. The specs are great (mine is a 5th generation i7-5500u processor with an Intel HD Graphics 5500 GPU) and all the ports you need are there.
Build quality is excellent and touchscreen lets you make the best of the Windows 8 experience (though I have to tell you I am still fonder of Windows 7).
The battery life is very good but bear in mind that if you use the XPS 13 display at its high brightness setting, you will get about 6-7 hours instead of the 10 hours in the low brightness setting. It's a trade-off you have to decide for yourself. Use the XPS 13 with its glorious display at full tilt or try to save some juice for a long flight.
Some small gripes: I only wish it were a tad lighter. It is 1.26kg for mine, and 1.18kg for the non-touchscreen version. I know, I'm being demanding but at my age, every gram can be felt.
I also took a while to get used to the trackpad. I find the webcam position at the bottom left a bit awkward but if you want an edge-to-edge screen, something has to give, I suppose.
Also, bear in mind that 8GB RAM is the max you can get in this laptop.
If you are looking for a Windows laptop with a 13-inch display in an 11-inch body, this is it. This is a very well-rounded workhorse PC laptop.