Razer's Imperator is pretty standard right-handed Razer gaming mouse (5600dpi tracking, etc.), but it has sliding thumb buttons, so you can adjust exactly where they sit on the mouse. Could be gimmicky, but I'm definitely intrigued. [Razer]
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Meh, I am not as impressed with that as I am with the new Razer Mamba I just picked up.
Loving the Mamba so far, and even though it isn't mac compatible, works ok with it as well.