Like most of us here, I spend a lot of time at my computer. And while I've already invested in a good chair and an adjustable desk, I need to upgrade my mouse. So, I'm curious...anyone here use a trackball or a vertical mouse for normal computer use? I'm not a gamer, so I don't need a ridiculously advanced mouse...just something that has left/right, scroll, and back/forward buttons. Wireless would be good, too.