A statistic no one ever really discusses when they are looking for a good gaming mouse is weight. It's such a key thing, too. I've been doing a ridiculous amount of research into mice and finding out what I want in one.
I claw grip my mouse.
I pinch with my thumb and my ring finger to pick up and move the mouse when it edges on a pad.
I want a mouse that is at least 95g (heavy).
I product sampled a few mice over the last few weeks and I realized that mice with a ton of thumb buttons are more difficult to quickly pick up and move when you get to the edge of your mouse pad or comfortable moving area. I kept accidentally clicking a thumb button when I was just trying to move it. I also had tried a few light mice like the DeathAdder. They felt far to cheap and jerky for my movement input. I need a mouse that can give a little resistance and feels like its actually resting on the mouse pad.
Here's my short list:
Steelseries Sensei - It's a 97g mouse shaped similarly to the Microsoft Intellimouse 3.0 and that's definitely a good thing. I haven't had a chance to use one because no store within 200 miles of me has one in stock, let alone for use in store.
Cyborg R.A.T. 7 - Despite the mouse's grotesque looking facade, it's incredibly comfortable to use. And if it isn't, move some parts around on it. It's a customizable Franken-mouse. And it has adjustable weighting to it, as well.
I'd love more mice to consider, but it's actually hard getting the statistics I care about listed for mice only available online. Most manufacturers will tell you the weight of the mouse with the cord included, so that doesn't tell you anything at all. I was really looking forward to getting the Steelseries Diablo III mouse until I read a review that said it was one of the best lightweight mice available. Instant turn off.
I hope some of this info was helpful. If anyone has any more suggestions based on what I'm looking for, I'm open to them.