I had the old wow mouse for around 7 months, then the mouse wheel broke. I've had two steelseries headsets, one was broken since I got it shipped, the other one held for around 4 months. Moral of the story; steel series products have shitty quality (in my experience).
I would recommend either getting Razer naga original or molten edition. They're virtually exactly the same, depends on what looks get you off the most. Razer Naga epic is a big step forward with the detachable left side of the mouse for customizable comfort, but the downside with it is that the two side buttons that are on the original naga are moved to a really awkward position, smack down the middle of the mouse. You'll accommodate to the extra buttons in no time, if you can handle having a week or maybe two where you suck ass, just to learn it. It will all be worth it.
The steel series mouse won't change your game, the naga will.