Evan,
The reduced deposit is $450 per room, per leg for a total of $1,350 per room for all 3 legs combined. The reduced deposit only applies to bookings for all 3 legs. If you book one or two legs only, you have to pay $450 per person per leg.
If you book into existing group space, the deposit is due 12/15/2007, and then that's it until final payment (Oct/Nov 2008). For example, I have suites, D1 balconies, and inside rooms in my group space. If you want an F ocean view room, it would have to be booked as an individual reservation with the $1,350 due in 7 days (and then nothing else until final payment), and then it can be pulled into the group space to receive the amenities.