I was down on tablets for a while until I tried using one with Manga Studio and found just how well when paired with the right software it can emulate real pens. The software has some cool correction settings too, so that lines can look as penlike as possible. In fact, I stopped using Illustrator altogether when I got a copy of Manga Studio. (then again, I don't need color)
Even though I abandoned Windows (there is a Mac version too) a long time ago I still keep Manga Studio running under Wine, I do need to get a decent Linux compatible tablet before I really get to mess with it again. Unfortunately, with my financial state, that could be a long time....