Aurora,
Don't forget when you are doing your numbers that in addition to the difference in the two plans (which I thought was around $16 per adult per night), you will also have to pay gratuity on the full price of the table service meal. so if the value of the table service meal is for example $100, you will need to figure on an additional $18 -20 per day for gratuities, over and above the quick service plan.