I just got a new mouse a few weeks ago. I ended up going with a Logitech G500 -
http://www.newegg.com/Product/Produc...82E16826104318
I love it. Very awesome feel in my hand, tons of control over the sensitivity, and being able to weight tune it is awesome. I really really like it - it just 'fits' my hand perfectly. The USB cord is cloth-covered to, which is another plus. Less chance of damage from rubbing against edges or from curious pets.