For the record, I hesitated for a while between the Sheraton Mirage Resort Goldcoast and Noosa, and I am finally happy to have pickep up Goaldcoast..
I also visited the Sheraton Noosa (no stay, just looking around), but I really prefer the Mirage resort setup with rooms facing the ocean (one of the very few hotels in the area with such a direct access to the beach / no roads or whats so ever..)