I'll be honest in saying I'm not a huge fan of Razer's mice, but it's nothing against the products themselves... I've just become so comfortable with Logitech's designs that I've stuck with them. The Habu was a little weird in getting used to, but it was fine for the most part. About a year after using it, I had big enough issues (sporadic bouts of severe loss of tracking-ability), so I went back to a Logitech offering. I'm using some Gigabyte mouse at the moment and it's serving the purpose. For the gaming/benchmarking machine, I'm using Gigabyte's GM-M8000 and it's also pretty good. It's a little bulky, but it's comfortable once you get used to it.
I am very, very tempted to go wireless though, so thanks for all the information Kougar. The room I'm in is so embarrassingly small, and behind my desk are huge piles of cables, so I'm always getting both the mouse and keyboard caught up in them. If I can rid even those cables, the situation would be vastly improved.