Looking for a recommendation for a marine grade wind generator - good power output, low noise, reliable etc. Any recommendations?

Here's one from Defender:

Wind generators: Sunforce 400 Watt Marine Grade Wind Turbine / Generator Sunforce 400 Watt Marine Grade Wind Turbine / Generator
Item # : 202044
Max Power: 400 Watts or 27 Amps in Ideal Conditions
Fully Integrated Regulator, Shuts Down When Batteries are Charged
Material: Cast Aluminum Body, Carbon Fiber Composite Blades for Low Wind Noise
Brand: Sunforce
Model Number: 44444-3 Sunforce 400 Watt Wind Turbine / Generator is a lightweight, portable and quiet wind generator ideal for charging your batteries. Features: Use wind to generate power and run appliances and electronics Multiple Applications: Cottages 12 Volt DC... more... List Price: $679.99
Our Price: $599.99

You can also go to Westmarine.com for other brands.

Try asking your question here:
http://www.cruisersforum.com/forums/f14/

I had D400 on the last boat and it worked very well. The only downside was the unit weight, but once installed it was silent and put out a good amount of power.

I agree there are two D400's on the yacht behind me right now and they are silent.