Ethernet over Powerlines

I'm looking into networking my house using power lines. I'm gonna use the network to connect a couple of PC's for browsing and 2 gaming consoles. Mostly though, I plan to use it for HD video streaming. I'm talking about 5GB to 12GB .mkv video files. There's only gonna be 1 stream going at any given time.

I've been looking at the Linksys adapter and it claims to reach speeds up to 200Mbps. I really don't know how well it performs nor know anyone that has used it.

Will the power lines provide enough bandwidth to stream without having any problems?

I tried some of the netgear ones and... the wiring in the house was from the 70's... it was totally useless.

It could be a better investment to hard wire your home w\ ethernet jacks, or depending on distance try a wireless router. I haven't used wireless N yet but the range is supposed to be much higher than a,b or g.