Ideally, all your wifi units (including the router) are from the same vendor, for that enables a higher convenience in maintaining the network. Configuration convenience aside, this doesn't matter...

The PLC network may contain multiple adapters, up to 250 if they're all from the 1200 series. You start with one pair, one at the router and one at your first endpoint destination. With these paired,...

Again the warning: US and EU devices may be mostly identical, but emmisions regulations are not. Country (or region) specific firmware excludes specific frequency ranges from use by powerline...

There's an 8630P (with Passthrough) and a plain 8630 (with rabbit ears antennae and no passthrough). Just for the maturity of the PLC chip and firmware, I'd never use the AV2000 stuff. So for your...

By any means go with the AV1200 series (now stupidly renamed AV1300 to one-up the competition, but it's still really the same thing).

At least the 8010P V1 do have somewhat newer firmware available. http://www.tp-link.com/en/download/TL-PA8010P-KIT_V1.html#Firmware Mind your country specific version please. The link is for EU.