The Logitech M500 has just a couple of side buttons, making them easier to reliably select with your thumb. These can be assigned to any of a large number of functions. I use mine for "double-click", which works nicely in both shell and GUI to reduce finger fatigue.
$30 list.
Wheel shifts between fast-as-hell smooth roll and traditional clunky roll actions. It can act as a middle mouse button.
Corded, so batteries are not an issue.
"http://www.logitech.com/en-us/product/corded-mouse-m500"
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The Logitech M500 has just a couple of side buttons, making them easier to reliably select with your thumb. These can be assigned to any of a large number of functions. I use mine for "double-click", which works nicely in both shell and GUI to reduce finger fatigue. $30 list. Wheel shifts between fast-as-hell smooth roll and traditional clunky roll actions. It can act as a middle mouse button. Corded, so batteries are not an issue. "http://www.logitech.com/en-us/product/corded-mouse-m500"
1800 watt (~15 amp) maximum; LCD display; ampere, watt & power-factor modes; built-in tracking totals; possible PC integration: http://www.doubleed.com/