Wacom Intuos Pro or Wacom Cintiq are the industry standards. Intuos are display-less, Cintiq are monitors. Do not get a non-Pro Intuos (Intuos Draw, Intuos Art) or Bamboo. They’re not bad tablets, but they’re less capable then the Intuos Pros and there are cheaper / better alternatives.
I started using Wacom tablets before they offered monitors. Pen displays, as they’re called, were $20k+ things used by industrial design firms, not lowly artists. I was also trained to draw with out looking at my hands (life drawing and the like) so it wasn’t a big problem using one. If you’re used to looking at where you’re drawing, get a Cintiq 13HD, Cintiq 22HD or Cintiq 27QHD, depending on what size you’re used to drawing at.
People who want a pen display but don’t want to pay Wacom prices look at Monoprice or Huion. If you need something cheaper and don’t mind a tablet (displayless) look at a Huion or XP-Pen.