Hm, I just spent weeks on figuring out how I would connect the HDX to the network. A wireless bridge seems to be the worst option of all.
If you already have wirless you can easily measure performance with a few decent tools though wireless is highly dependant on the environment.
I also tried poweradapters but whenever they had to span over multiple powergroups performance dropped. Good enough for a DVD5 but not for a HD file. It's worth a try but beware that performance varies a LOT from house to house / outlet to outlet.
As you may guess I *had* to cable the HDX but with creative use of remaining pairs in existing phone cabling (cat5) I could easily hop from HDX to the "server room" upstairs.
It also passed the W.A.F.