Logitech M570. My RAT 7 died this year, and i replaced it with a cheapo steel series mouse as a hold-me-over until I could afford a RAT 9. well, that died too. in a month.

So, i went for a trackball. it going to take a little getting used to thats for sure, and I kinda want to replace the ball with a red one. (to match the rest of my PC set up) but so far so good!