The White Sands does offer a villa that can hold up to 12 people...I've put my family of 8 in there & they loved it...though it's across the road.
Crystal Waters offers nice, fairly affordable villas and are located directly on the beach.
Across the beach road for the affordable villa option...look into Villa Mora, Greenleaf & Ocean Breeze.
Other than that...I would just pick your favourite hotel and email them for availability.