I was able to custom-configure the XPS 13 with a non-touch display and 16GB here: http://www.dell.com/en-us/shop/dell-laptops/xps-13/spd/xps-1... (US link)
I run repair shops for a living, and I'd certainly recommend the XPS 13 over a HP. The build quality of the HP Envy laptops we get in are terrible. The XPS 13 is just a better laptop.