I recall most houses built around the early to mid 2k's had the stuff built in... was before wifi was truly affordable...
anyway bandwidth is the name of the game... with home interwebs wifi is just fine... but when you start moving big stuff you really notice it..
even a 10/100 hard wire is going to flow more then a wireless N when it comes to real world (in perfect theoretical the wireless N is faster... but it never is) change over to a gigabit lan and... if I transfer a few movies from my laptop to the desktop or vice versa via wifi it takes FOREVER... sometimes over an hr... plug in the laptop to the network and it's done in 5 min or so... (note that i'm using an old b/g network and haven't gotten around to the N like I should lol)...
GRtech... that HDMI thing is awesome... had no idea you could do that