I prefer Bluetooth wireless mice as there is no wireless dongle to get lost, tie up a USB port, or get caught on my laptop sleeve. The Logitech V470 Bluetooth mouse 
$40 is my current favourite:- Good battery life: 4-6 weeks of daily use on a pair of AAs;
- Basic functionality: 2 buttons, track and tilt wheel scrolling;
- No 3rd-party drivers required (OS X);
- Reliably pairs with OS X and re-connects on laptop wakeup;
- Laser tracking: no mousepad required;
- Compact for traveling, but a large enough for good hand support;
- Sleep-on-idle, as well as an on/off switch for travel;
- Symmetric design for left-handers; and
- Available in blue or white
Optional Software
I've not installed the Logitech Control Center (LCC) preference pane and driver, and have not found them necessary for OS X. In the past the LCC has had a reputation for being problematic. I believe that has since been resolved but I prefer to run with fewer 3rd-party drivers regardless.
I've not installed the Logitech Control Center (LCC) preference pane and driver, and have not found them necessary for OS X. In the past the LCC has had a reputation for being problematic. I believe that has since been resolved but I prefer to run with fewer 3rd-party drivers regardless.
The V470 does take a few seconds to wake up after it's gone into battery-conservation sleep, but I find that a small inconvenience for good battery life.
