I voted for Red Nails and a "City of Thieves" expansion. I feel that an expansion that doesn't focus on a region but more on a specific story is one I'd be interested in. Like a "Scarlet Citadel" or a "A Witch Shall Be Born" type thing. something where you could actually have some form of mini campaign to go with it along with a bevy of miniatures, and a hero or two. I think these two options would provide us with two solid locations with a lot of depth, lots of mob enemies and villains to work with, and a good cohesive narrative to frame your scenarios in.