One more big BIG fan of the Logitech M570 Track ball.
I am on my 2nd one. I don't remember how the first one met it's demise, but this one is going strong, and I do drop it on occasion. I spend a lot of time on the sofa watching TV (Netflix, etc). My TV is really just a huge computer monitor (but I don't recommend it for PP).
I will be buying a 2nd trackball mouse this weekend to use at work.
edit: The only thing I want a traditional mouse for is to play that old (old!) video game, Wolfenstein 3D. I also have to drag out the 32 bit box for that, as well...