The one I jacked was one I used for gaming at school, but then my mouse at home broke and I've been too lazy to get a new one. Hence I'm still using the school's one.
I actually have Razer Naga from when I played wow, the side buttons works great, used the driver to make button 1 = f1 and 2 = f2, that way I can switch between special attack/magic/prayer really quick.