Would you not get a better connection with a proper cable?
the actual losses are so small you would be hard pushed to find that a dedicated cable gives you a better conection. Although I would have though the cost of cable + labour would not have been feasible.
Its your call... but why bother when there is a product on the market to cover this exact problem, you are after all still hard wired to your router/hub
any Cat 5e or Cat6 cable will give you double the speed, the fastest ethernet over power at the moment is what upto 500Mbps Gigabit is 1000Mbps a top end kit will cost you ~ £60 for a point to point kit, for the same money you should be able to get 100M of cat6 and the facing plates.
I personally have my house wired up for full gigabit, in terms of throughput difference between the power link stuff, you wont notice any unless you're moving large files around e.g. on the powerlink stuff you'll get around 50MB a sec on gigabit 100MB per sec.
the powerlink stuff does solve a problem but if you're already re-wiring your house then drop a few cat5e or cat6 cables down whilst you're doing it.
