Both Razer and Logitech mouses are fine, but they are nothing compared to Mad Catz R.A.T 9
Now THAT is a proper gamer mouse and its amazing.

As for the mouse problem. I had a razer mouse that had the scroll issue AND Razer Taipan which had a similar problem where the mouse-wheel click function wasn't responding as well till it just stopped working. So the sensors in those mouses for wheels are quite low quality or just not that durable.