saddle for mixte?

Ladies! I haven't posted in quite some time as I have been ridiculously busy with grad school / jobs etc... Some of you may remember that I bought a mixte at a yard sale this spring. I am just getting around to fixing her up as my winter commuter. I live in Wyoming where it is cold and snowy. I would have a fairly upright posture riding this bike which is making saddle shopping for me more difficult. I am leaning away from a Brooks for this bike as she will see the worst of the weather we have here. I have a brooks swift on my single speed commuter; a Terry firefly on my road bike, and I am wondering what you Mixte riding ladies would suggest for a (non leather) commuter saddle for the mixte. Thanks for any input you have!