Superhub wireless is pretty much shite in all honesty, why not just put it into modem only mode and buy a decent router, i have a tp link router with 3 aerials and its great, can pick my wireless up from around 100 yards out my back gate. Wired ethernet will always be better if theres only a couple of devices, but i guess most households these days have at least 5 devices in all different rooms that need connected. What your saying would work but through the powerlines im not too sure how good as iv never rated homeplugs for speed, although i have a few round the house that work day in day out. Worth a try 1st but id still go for a decent router everytime!