never heard of roccat. razer in general is a mediocre company charging top dollar for their products. not bad products but not worth the price either.
i use the razer deathadder and it does the job. the only complaint i have so far is that the rubber texturized finish was a bad idea. it is a dust magnet and feels gritty unless you constantly clean it every few days.
look into logitech. the g9, g500 and even some of the non-gaming mice are very good.