My first wind
gen was an aging Airx. It produced decent power when the wind
was up, but howled somethin' fierce. When the internal regulator
died (yay!) I replaced it with a Silentwind. They are the "blue blades" makers who started to sell their own gen a number of years ago.
My top criteria for when I was looking was: quiet, power output, size (weight) and cost. I liked the D400, and probably would have got one if they weren't so heavy. They were more than 2x the price
of everything else.
The Seilentwind is rated at 400 watts. It produces pretty much as per the adverrtised specs: little at low speeds, but ramps up big time as the wind speed goes past 15 knots. Pretty darn quiet as well.
BTW, I know the OP asked specifically about wind gens, but I'd be remise in not saying most people's best charging
comes first from a good solar
system. Our wind gen is a good supplement, but the solar
does most of the amp work