Avocet O2 Air 40 women's version. Unfortunately it's backordered right now and odds are you won't be able to find it (my LBS said August or so). There may also be a touring model.

The Selle SMP has a really wide nose- I found it rubbed too much.

The Rosie would be a good one to try if you want to avoid the Brooks- I think it is a little more pear shaped than the Avocet though.

Good luck- (and definitely let us know if you find something).