Wacom Tablet if you can afford it! You don't need the biggest. 6x7 or so. Best $300 I ever spent. My experiences with trackball left me with a case of carpal tunnel syndrome. The mouses have never bothered me. I love the wireless by Microsoft. some of the logitech ones were not as accurate.
By the way large doses of vitamin B12 or 6 (can't remember which) cleared up the carpal thing and I have never been bothered since.
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