@ko If your not in a hurry, keep your eye on the Pinetab, it will have detachable keyboard and optional cellphone radio, 10 inch screen. Will likely be upgradable to rockchip 3399 later - Easily as powerful as the lower end chrome tablets (which are also a good all in one option if you don't mind Android apps).
If you need some Android apps but want mostly Linux, Anbox for x86 is installable as a snap and is further along than the ARM version. As others mentioned, you can still run Ubuntu Unity 7 on an x86 touchscreen tablet (16.04 only), or Ubuntu Gnome. Both run fine and are the most workable x86 tablet solution in my opinion. I have a Thinkpad X1 tablet and it is a wonderful mobile solution with Ubuntu. All works including cell radio and I take it everywhere.
KDE Plasma is also a popular option, but I just prefer the design and workflow of Unity.