Basically, It depends on what kind of player you are. Razer's mouse are most for high sensitivity players because the grip is different as the other mouses. It's more like you play with fingers you use it. It's great, I've bought one (actually it was a Razer Diamondback) but I returned it back realized I wasn't such a high sensitivity player.
If you're a low sensitivity player, I would suggest the MX series or a MS intellimouse 1.1, 1.1SE and MS intellimouse explorer 3.0. The MS mouse are more recognized to have a very nice grip like the MX series. I've heard that the MS's are way better than the MX's because it seems that they are way more comfortable than MX's. I myself ordered a MS intellimouse explorer 3.0.
I'm currently using a MX-518 and all I can say is it is a great mouse. You can choose the number of DPI (dot per inch) 400 to 1600, 7 customizable buttons and a good grip. The Razer's mouses are similar. Take Diamondback for example, you can also choose the number of DPI ( max 1600, min 400) 7 customizable buttons. But like I said, Razer's mouse are more for players who uses their fingers on a mouse than players who use their wrist. Always remember one thing : A mouse is a pure preference choice.
NOTE: The MS intellimouse 1.1 SE and intellimouse explorer 3.0 are discontinued so good luck finding one. Best way to get one is to check on ebay.
Oh yeah and about the Razer copperhead ( and other laser mouses) you need to check if they are compatible with your mouse pad because some people had problems with tracking their mouses on their mouse pad. A solution to that problem is to update the firmware.
PS: MS: Microsoft
