I only have a small desk for my Mac Pro meaning there's not enough room for a regular mouse-pad, so I'm looking for alternatives. I'd like to have a wired solution which leaves out Apple's Magic Trackpad which would be the number one choice. There's Kensington's various trackballs (Logitech also has one or two wired ones I believe though reviews seem to favor Kensington over them). As far as I remember Logitech also has a wired trackpad as well but as a poor substitute for Apple's offering. Finally there are the pen/touch tablets from Wacom, but as I already have a Intuos 4 I feel it's wasteful to replace it with another one just to get the touch capabilities (there are cheaper, low-end touch/pen tablets available, but then I'd lose out compared what I already have in the Intuos 4). So a trackball seems to be the cheapest choice (I'm open for other suggestions though) -are they good replacements for a mouse, and which model would be the better choice?