Find a central point (unused closet, laundry room, utility room), use that to pull tv, phone, ethernet, audio into that point. A Leviton cabinet works if you want their gear, but in my case, I got a 3' a/v rack with two shelves & a patch panel that I use for my networking center in my basement. The U-verse gateway & 8-port switch is on a shelf, with all ethernet going to the patch panel. I use white patch 2' patch cords for the u-verse boxes for the tv's, red 2' patch for ethernet. Have not decided what color I am going with for the 360, blue-ray. Roku is Wireless, since it can't get any faster than 6 meg speeds from netflix, and we rarely use it that much.
Problem with a mixed network, is that your speeds are only going to go as fast as the slowest devices on the network, unless you segregate with a managed switch, to separate your LAN into various networks, and that will also allow you to handle mixed network. In reality, a backbone should be Fiber between the router & first layer switch, then gig then on for each back bone, but in a home, 100 meg is good enough to the router, since everything will move along the switch between devices if transferring data. When heading out to the real world, as stated before, data will only go as fast as your provider allows (again slowest device determines data speed).
Start by laying out a plan, that means if you have the blue print of the house available, use it to determine how many pulls of ethernet, coax, a/v for entertainment area. Then count number of devices, times that by 3, and that will give you total runs. Entertainment centers can end up with min. 6 runs, but I would just go with 2, and go with a small 5 port switch if needing for more than 3 devices. I myself have around 11 devices wired right now, with room to add a switch and go with 13 more if need be.