Also when we talk about a modem, we´re reffering to just one line connected to your computer with a cable, and a router is usually Wireless, with 4 to 6 lines (channels) to link with 6 diferent users. Personally, i consider the router a much more useful and practical device. Mine is currently working at 32 mbps, and let me work with all freedom in my home´s office, while my wife is on the living room with her laptop too, for example.
It´s a very good aquisition.