Hi Seawitch
From a female perspective e.g. taking our different power to weight ratio in to consideration. I can let you know what works for me.
I have been windsurfing for 10 years now and finally believe I have got the "right" gear for me.
When it comes to sails, I have owned:
KA - quite a while ago, didn't like it too heavy even though it was only a 5m
Tushingham Vulcan - liked it, bit difficult to rig correctly. I believe the Vulcan has been replaced by a different name now.
Hot Sails Maui Diva - I made the most progress with this sail. Absolutely loved it - light, easy to handle, easy to rig. Just seemed so much easier to water start and gybe.
Neil Pryde Zone - I replaced the Hot Sails Maui Diva with the Zones and regretted it for a bit - took a while to get used to them. I would get catapulted regulary if I didn't get the gybe completely right e.g. the power would come on very sudden and I couldn't hang on. With the Diva I found I could "muscle" through it.
Naish Session - these are the sails I am using now and love them - light and easy to use and to me they feel soft.
The big difference for me is that I changed to skinny masts this year. What a difference -when handling the rig it is much easier, definately worth the money.
The best thing is to try before you buy whenever possible - ask other sailors if you can have a go on their rig if they are using the sail you are thinking about, most will let you have a try.
I have tried the Ezzy Wave Panther and I know it is very light on the scales it felt incredibly "heavy" to me. Ezzy's are cheaper than Naish so I would have loved to like them but, for me they didn't work.
Hope this is of some help