I suggest the Death Adder for sure!
It is the best mouse ive used, beats the hell out of my Copperhead and the copperhead is very similar to the dimondback in shape, feel and looks.
I think the Death Adder also looks better than any other mouse. with sleek lines and a great black finish.
The death addder also has a better 3G optical sensor than the 2G sensor in the diamond back, with other great features like 1000hz ultrapolling, a far superior on-screen sensitivity changer ASWELL as DPI switching.
The side buttons are NOT hard to use, it is Razers best side button assignment IMO the diamond back has terrible side buttons imo. The death adder's are large and easy to click, good placement, no accidental clicking aswell.
The non slip surface of the mouse not only looks great but helps u grip the mouse well. Also adds to comfotability.
The mouse has a GREAT shape and feel, suitable for whole hand holding or just your fingers, EXTREMELY comfortable.
Very smooth movement from Telflon feet and 1800DPI engine.
Has low lift off movement (doesnt move when u lift it off and put back down)
Doesn't skip when moving extremly fast, great sensor, good for low or high sensitivity gaming.
5 different profiles for different games, programs windows usage anything u like really.
Excelent Drivers, can change many things easily with the razer driver, including pesky windows mouse options like acceleration. Constant updates, and even firmware updates.
There are also TONS of stories of the G5 Breaking for no reason, bad quality imo... if you absolutly have to get a Logitech mouse, then go for the mx518, NOT the G5, its junk.
I HIGHLY recommend the Razer Death Adder over ANY other mouse. Its the best mouse Ive used, do yourself a favour, go pick one up and start fragging!