RE: Nitro planes fastest EDF (stock)
Well you did say "which is the fastest"...
Without having all of the models side by side for speed gun tests, this is hard to determine.
Power to weight is a good indicator, but it is affected by how "dirty" the airframe is in the air.
My F-35 hums along pretty well, as does my FA/18, though the latter may require the installation of a separate BEC.
The FA/18 uses higher voltages, with a slightly larger airframe.
Check out the on-line videos to get an idea of how they perform on a fly-by.
Also remember that when flying something like this, that YOU will perceive it to be flying slower than it actually might be...
The first time I flew one of my XPD-8s, I started complaining to someone who was watching that it was much slower than I expected... even with a suped up power system... His comment was that it appeared to be VERY fast from his and everyone else's perspective watching it.
That said to do it right you really want something like this:
[link=http://www.nitroplanes.com/f20tijetnera.html]Click me![/link]
And then put in your own high power EDF subsystem in it... Something that puts out 3lbs+ thrust will make that plane scream.