everyone uses waicom tablets, but they are the most expensive. they are pretty nice though..they have really nice pressure sensitivity. you don't need to get a huge one either, one of my old roommate's had one.. i think it was about 5 x 7, and that was plenty of space. it takes a bit to get used to, as i've tried to use a few, but once you get the handle of it, it will be more natural obviously.
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