I completely agree with Alex. I have a few gaming mice, and honestly it wasn't worth the money. Sure some of the stuff is decent, but I would never say its a "must have". I'll take my trackball mouse for normal day to day stuff and a regular mouse for gaming any day of the week over a $150 gaming mouse.
You don't need to spend that much. Spend £10-£20 on a mouse that has a few extra additional side buttons. Hey presto, your experience is enhanced. Moreover, browsing experience on the web is enhanced.