I've been to Rixos Hotel, and it's really one of the best hotels I've ever been to

Most of the hotels there offer good options for families with kids. I would recommend Rixos Premium Belek, Asteria Kremlin Palace, and the Land of Legends Kingdom hotel. But you might also ask your local travel agents about special offers they might have. Pay special attention to the last-minute tours because they are way cheaper than regular ones.
I also recommend studying independent sources like avidtravelclub.com. You might find there better offers and independent reviews from the members of the club. The more attention you pay to choosing the right tickets, the more money you will save.