Well its your money, and to be fair the games you've quoted are hardly hardcore in the mouse department. unless you suddenly develop the urge to play hardcore FPS then I'd say save the dough and get something else.
Logitec/razer seems to be largely a matter of taste, many people swear by one or the other, personally I'm a razor man but if you do decide to get a gaming mouse then just go with which appeals to you most.
I have a diamondback plasma btw