Don't tell the wife but I have
6 desk tops
3 WHS servers
running at home currently. All are connected via Apple Extreme 5ghz and gigabit LAN.
I have at last count 8000 tunes, 1100 movies and a bunch of tv shows on the servers which we stream to the ATVs via ITUNES and to Win7 boxes directly.
My IPAD will be an interface to the network and will seldom if ever leave the house. I have 4 different sized laptops for travel missions. Besides, I am never more than 50 feet from WOW and Planetside.
So the wireless 16Gig is fine for my needs.