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Based upon your description you may be able to just buy a 4-8 port switch. A switch can be put between your router and your TV and/or other devices. You don't need to worry about port speeds too much with the router port as I'm sure even 10/100 will be more than anything your ISP can throw at you bandwidth-wise. Even Comcast business class top of the line option is only 50mb/s. If you have any device to device transfers(inside the router) like from one pc to another then and only then will port speeds make a difference. And, in such a case a gigabit switch would still be much cheaper and easier than replacing the router.