Slightly OT - Been using the Solwise 200AV homeplugs for a couple of years and rock solid. Streaming video from network drive to tv is great :)

Words of advice :
- don't mix n match supplier, it should work but pita.
- make sure all devices use the INT64xx chipset and not the cheaper QCA one else video streaming is comprised.
- use piggyback ones where possible, it saves hassle with extension leads and getting enough sockets
- don't bother with 500AV, it's no faster unless your mains wiring is top notch and short, esp if you have multiple rings.