Dan,
You've got almost a year before your trip, which means you've got as much as 5 months before you need to book the accommodations. I suspect many places haven't even set summer 2005 rates. The places recommended so far are good today and will likely fit your needs in mid 2005.... But are you really going to make a decision today?
Planning a trip to Belize is part of the fun - take your time, research places on this board and get a feel for the island and the lodging options over the web. Before our first visit to Belize in '99 we spent many evenings getting excited about the places we learned about.
You can start enjoying Belize before you ever leave home.