I'd be inclined to go for the same paint on the ceiling. Your rooms are large and the colour is neutral so you should have no problem carrying it off. The off white colour tends to be warmer and softer than 'brilliant' white. I've painted my rooms a warm white in the past and when I was retouching I was sorry the ceiling wasn't the same colour as it's so handy. The only drawback I see is that if you don't go for brilliant white, it tends to be more expensive. Happy painting, Priscilla.