I highly recommend Logitech's VX Nano. I've had mine for almost 6 months now still using the original batteries, and I use it every day! It's small which I thou

I highly recommend Logitech's VX Nano. I've had mine for almost 6 months now still using the original batteries, and I use it every day! It's small which I thought would be a pain at first (remember Apple's infamous "hockey-puck" mouse?), but it really feels natural in my hand. Also, it is precise on any surface I use it on, using the laser sensor. I really like the dual scroll wheel (clicky until you press down and then it freesrolls through any doc in 2 seconds) and the forward/back buttons. Its receiver is so tiny I just keep it plugged into my laptop and never worry about it. I could go on and on and on, but you get the point.