Please do yourself, and your neighbors a favor, and avoid Broadband Powerline devices if at all possible. They do terrible, terrible things to other users of the radio spectrum.
http://www.eham.net/articles/6599Fortunately, they aren't too popular these days, largley because of these issues, and because regular old 802.11 b/g/a/ac are much easier to implement.
To original topic, my wife loves Chromecast. AppleTV is pretty slick too. Either will work well for Netflix.... but Roku probably gives you more flexibility for tasks other than simple streaming. I would not recommend chrome cast if you don't have android phones.