BD Video movies have a maximum data transfer rate of 54 Mbit/s
802.11G will do that, at a max. 802.11N will give you head room.
gig ethernet maxes out around 800 Mbit/s worth of real data payload. so it will be plenty
but check this out:
With that bad boy, you can put your sata 3.5" drives into that and connect it over e-sata which is plenty fast to the machine. It even comes with a pci esata controller card if your mobo doesnt have one on it.
or you can get a bunch of these:
then get some pci esata controllers and connect them and stack them up next to the pc.