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You can either go for a 1 ton AC or a 1.5 ton AC depending upon the amount of light that enters the room, area and direction of windows, the floor on which your room is situated, number of people occupying the room and the number of lights.
If they want to do ENERGY STAR new homes, though, and their Manual J reports are coming to me, they should know that I've got my own rule of thumb - 1000 square feet per ton. When that 2000 square foot house comes to me with a 3 ton air conditioner, I have no choice but to look further because they didn't pass my rule-of-thumb test.