I'm considering the BB Z10 as well. I'm absolutely spoiled by the N9's UI and love the phone's form factor. Can't stand to use my wife's iPhone.

I'll wait until Jolla 2 comes out to see if it will support US frequencies. But I'm not holding my breath that it will since Jolla has stated US is not in their marketing plans.

So the BB Z10 looks like a viable option.