They are a lot to take in. If you haven't had a chance yet, (you'll need about a half-hour, minimum) check out all five concepts at urbanstl.com.
Our early favorite is the proposal from the Behnisch group (right) -- only because it's the most Salvador-Dalí-inspired. BTW: What are those floating balloons (or planets?) in their proposal and why not make them floating tigers being devoured by goldfish?