If it’s your first one, I highly recommend the Intuos Pen!
It’s only $79, and a great starter tablet. It’s the one I’ve been using for five years! (Before I was using their old bamboo line, but that’s been discontinued)
Otherwise, you could get the Intuos Pro Pen+Touch
That’s for $250, and while I’ve never used it I’m sure it has better pen sensitivity. It’s also wireless and has Expresskeys like my Cintiq.
Hope that helps!