My own favourite is the US government's very own forecasting service:
http://www.arl.noaa.gov/ready/cmet.html
Choose the Aviation 6 hour model and make sure to fill in the code at the end of the page (to stop people using it as a live feed)! Exceptionally accurate, hell it even gets the change in weather in Donegal correct!
I will review and add some if not all of the links you describe. Thanks.