I've used both Naga and Logitech MMO mice. I found the naga impossible to learn (you basically need to keep the temporary guides on permanently and they aren't really intended to be used that way), logitech slants them slightly so it is easy to distinguish between rows and use them. I love them for additional click heals, fishing, speed boost / autorun, mount and ground effect clicking (its more intuitive to me to use the mouse hand to lay ground effects or heals than a keyboard click then a mouse click).

I hate razor software, I'd choose logitech or corsair any day. Also, mechanical and you won't go back.