Defenitely recommend the Xai (see signature), simple reasoning behind it really.
I've owned most of the major gaming brands (Razer, Microsoft, Logitech etc) and the biggest problem I have with their products is not necessarly the performance, or the looks, or even the drivers, it's the durability.
I'm a competetive gamer, and as such my gaming hardware takes alot of abuse (such as my keyboard and mouse) and with the other products I've found they tend to die after a few months (read 6-8 months) of heavy usage. The problem is the financial impact of having to buy a new mouse every now and again is what really put me off the other brands.
I got myself the Xai and 7G keyboard and haven't looked back, best Gaming peripherals I've ever owned without a doubt (albeit not the cheapest).
The Xai is also a ambidextrous mouse, so you can use it either right or left handed. The only problem I have with this is that it has the forward/back buttons on both sides, and seeing as I'm right handed I end up pressing the right sided buttons alot (and if they are bound to a macro it executes the key/macro, which can cause havoc in your games) and have ended up disabling them.
My 2c