The more the better, i ended up with 60 or so terminations in my build (4 bedroom house) i cabled it myself then had it signed off by an accredited cabler when he was over for a BBQ. 8 in the lounge room (6 behind the main entertainment unit 2 behind the couch) 4 in each bedroom (1 where the tv is, 2 at the desk and 1 behind the bed) 10 in the study (all 10 behind the desk) 2 in toliet, 2 in main bathroom and 2 in ensuite, 3 in the kitchen, 3 in the dining room, 4 outside on the deck, 4 in the double garage, 4 in the third garage and 6 in the shed. All Cat 6. As mentioned you can run HDMI over it, so that was the original plan, basically have a media system in the rack that i can stream to anywhere in the house. Was cheap anyways, used a bit over 3 rolls of Cat 6 + 3 wall plates and terminations etc, cost was <1500 all done and dusted. 28 of those ports are 10gb as well.