Hey Martha,
I just bought the 2010 Avail a couple of weeks ago and I too have found the saddle incredibly painful! Between that and realllly sore hands, I have had to put it aside and keep on riding my old hybrid until I get a chance to get things fixed up in those areas on the bike.
I found that with the saddle it wasn't really my sit bone area, it was the 'delicate area at the front' that was being squished most uncomfortably 
Now comes the fun search for the right saddle....
Glad to hear that your new saddle is working for you!
Linda.
2008 Giant Elwood hybrid/Crappy gel with big chunk out of it!
2010 Giant Avail/WTB Deva Womens