N wifi will not benefit you with the PS3. It can only run G wifi, and to top it off, it has one of the worst wifi adapters out there. Generally, you will be lucky if you get a thruput of 20+ Mbps. If you want to truly watch HD media on your PS3, even more if you decide to feed it 3D material, I suggest doing what you can to make it a wired setup either by moving equipment, getting some kind of N wireless bridge with 100 or 1000 mbps ethernet ports, or some kind of home plug setup ( the latter two can even be iffy in my experience, wired is much better ).
There is also something like one of these N adapters. This one is only an example
. It allows you to take advantage of being wireless if needed, increasing your capabilities as far as from G to N wireless, and then takes advantage of the ethernet adapter on the PS3. Several models/brands online to choose from, just posted first one come up on search.
That's what I would do in your situation. Perhaps you will have more luck with wireless, but most people I have tried setting up eventually go wired to save the headache.
You can manipulate bandwidth and video quality settings to try to make HD video work with wifi G to the PS3, but you will most likely be disappointed and/or frustrated.
I can't speak on your other wireless device. If it actually has N capabilities, you should be able to make it work.
Power plant wise, you got a nice set up though.