I kinda like the XPS 13. Good hardware and looks nice. I just checked the Dell site and found the same with Windows 8. It looks to me like its exactly the same hardware, just different OS. So what's the difference in price then?
The Ubuntu one costs 1049 EUR and has a 50 EUR discount which puts it at 999 EUR. The same one with Windows 8 costs 1169 EUR and has a 120 EUR discount which puts it at a 1049 EUR price-point. So it's 50 EUR cheaper to buy the Ubuntu one. But somehow the Windows version has 70 EUR more discount. Which would make the Ubuntu version 120 EUR cheaper. I can buy a Windows 8 OEM version here for 80 EUR. So without the discounts it would even be cheaper to buy the Ubuntu version and a Windows 8 copy.
Additionally you wouldn't have all the preinstalled crap on your machine. The last two Dell laptops I reinstalled even before booting them once. Anyway I really like the XPS 13. Especially with this shiny full HD display.