Not sure if you've booked yet, but was at Momi Bay earlier - amazing over-the-water bungalows without Tahiti/Maldives prices:
http://www.marriott.com/hotels/trave...sort-momi-bay/ - click Rooms - Over the water bure
Definitely worth checking out! I had a Royal Lagoon Bure, not an over the water, but it was still pretty amazing and I'd go back there in a heartbeat.
Restaurant (Fish) was spectacular and the breakfast was fantastic. Just a relaxing place.