We just stayed at the Hilton Orlando - it's literally right there next to the convention center. The pool was gorgeous, lazy river was lovely. Full service hotel. The rooms were big and comfortable, but I felt they needed a good spring cleaning. We scored a good deal - points and cash and no resort fee, otherwise it is expensive. Parking is $18/night - there was plenty of parking.
What are you looking for in terms of budget? Amenities? Maybe someone else has a suggestion.