Thanks everyone, so much, for your input! We're going for a relatively short time (4 nights), and we've planned a full day at MK, a full day at Epcot (our favorite), and a day day at AK, with dinner at HS (50's Prime Time). We've left the first evening and last day open to relax and enjoy our resort, and maybe Disney Springs.
I think that after a bit of research I'm starting to lean towards BWI, because of it's proximity to both Epcot and HS, and because of the Boardwalk itself. It feels like a destination in and of itself. We like to end the day with a few drinks, and the Boardwalk (the microbrewery in particular) seems like a pretty nice option, and something different than a typical hotel lobby bar. I've also heard that the buskers on the boardwalk can be pretty entertaining, and I think my kiddo would enjoy that. I also really like the thought of being able to walk back from a couple of the parks in the evenings. Although we're Floridians (and Athenian), we do quite enjoy the cold weather (I spent most of my twenties in Chicago and London), and that doesn't feel like too much of a deterrent. I also think that the whimsical look of the resort would be really appealing to us, creepy clown notwithstanding.
In regards to WL, although I've always wanted to stay there, I think that I might wait until the construction is finished, and go then.
AKL still circles back in my mind because of the animals, but the truth is, that with the exception of early mornings and that last day, our time spent at the resort will be limited to late nights, where we won't really be seeing many animals at all. That being said, catching a single glimpse of a giraffe or a zebra from our room would probably "make the trip" for both my boyfriend and my daughter!
These decisions are tough! I thought I had decided when I started writing this post, but now I'm not so sure!
Back to more research....