Also, check out the Dell XPS series.
I'm not a Dell fanboy, but thought I'd offer a second opinion as this section of the forum is very much Pro-Lenovo and for good reason... they do, very broadly, offer the best PC laptops you can get. But Dell occasionally puts out killer coupon codes that make them a better value for the dollar than Lenovo's offerings, in my opinion. I got my XPS 15 with 16 GBs of RAM, a 1050 GTX ti, and 512 GB SSD for $1290 after taxes. I upgraded the warranty through Dell to two years with accidental, no questions coverage for something like $150 - and already used it once for a drop and am more than happy with their service.
If you don't need a discrete GPU, the XPS 13 is as good of an ultrabook as they come. They just released a revamped XPS 13 2-in-1, the first laptop with 10th generation processors. It looks really, really good.... refined design, 16:10 beautiful screen with no bezels, and the maglev keyboard is really, really awesome to type on.
In my opinion, and as the owner of an XPS 15, the X1e is superior to the XPS 15. I knew that when I bought mine, but the value for dollar was so, so, so much better with the XPS 15, and there are some advantages to my laptop, too - the battery life is an honest 9 hours with regular use, 11 with very, very light use. To someone with experience in buying notebooks that claim "15 hours of battery life" - I wasn't expecting it to be anywhere close to their claims. But it's very obvious that Dell puts much more attention into the XPS 13, as they refine the design every year, and that new 2-in-1 that was featured at Computex is evidence of that. It's neck-to-neck with the X1c, perhaps even superior.
Perhaps a build-your-own desktop workstation and portable 13" Ultrabook combination?