These are console whole house ones. I'll look and see if they have any that are attached to the furnace. (ETA: They didn't)
We have an Essick. It's okay, sometimes it's a pain in the butt to keep it running if it senses the one bottle is low. We kept it downstairs in a 2800 sqft house, but really I wouldn't have minded one upstairs.
The Crane drop is rec'd as a Best Buy in Shop Smart magazine. I plan on getting one for our bedroom (and will prob get DD the Hello Kitty for her room)
My mom just bought the Air O Swiss that was rec'd above. I ordered it for her off of amazon.