Wacom has the best tablets hands down but regardless of what you think you'll need to practice to do things on it. I've been using them for years and I'm still not 100% comfortable drawing on it vs paper.
Other tablets typically need batteries or have cords, wacom holds the patent on their special 'powerless' pens. At least that's what I recall from years ago, if that's changed I don't know.
I've used the graphire, intuous and now the cintiq. Great things