I have a Wacom Cintiq 13HD and had it for about 9 years now and am still very satisfied with it and highly recommend it.
I don't think it's even available anymore, but I'd recommend to get the oldes (=cheapest) Wacom Cintiq model that's still available on the market. I think the newest one is 22 and costs over $1000, but you can still get older models like the 16 for around half that price.