I want to buy an external monitor for my XPS 13 9350 DE.

Since the device has a 4K touch screen display, I would like to have the same for the external monitor. I imagined something in the 27" to 32" range.

But searching around, this seems to be more difficult to get than I assumed.

Are there any devices known to work (Dell or others)?

Is the coice of docking station or Tunderbolt to HDMI cable important?