You could try using a UPnP/DLNA server (Serviio, Mezzmo) instead on the PC holding the media, you wont get XBMC media library* but for playing files it would give a speed boost to the powerline adapters.
* It is possible to sort of get XBMC media library if using XBMC as a UPnP server to other XBMC instances as clients.
I have about 4 Tb of movies, so they will need to stay where they are on the home server.
it's strange. Apple TV, wireless, never fails. built in Hulu app hard wired on same tv through power line adapter buffers on occasion. Apple TV makes a good product for sure, just no xbmc on the latest model.
might do plex on my roku, but it is a little flaky.
I've never tried a setup without any DTV receivers at all, but in two rooms I have a DECA with an external power adapter to provide network access to the room, and that works fine. However, you probably wouldn't be able to have an antenna or regular cable TV signal on the coax at the same time, since DECA differs from MoCA adapters in the frequency range that it uses (geared specifically to avoid the range DTV uses).