@spivonious: I have a couple of them to allow me to hook my WHS up somewhere out of the way but without the reliability issues of wifi. I've never had an issue with it speed or reliability wise, though they really don't work so well through typical 4-way extensions, so you do need a suitable amount of free sockets and they weren't exactly cheap (they may be better now, I've had them a few years)

The ones I have are (I think) Belkin Powerline adapters and give around 200Mbps. Never had any issues with any kind of spiking and I'm reasonably sure they'd be designed to be well protected against that, given it's a pretty obvious problem.