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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.
Buy a ptac that will easily cool (and heat) your room without stressing the unit. The size of the unit should be determined by the size of your room. A 100-150 sq. ft. room will need a 5000 BTU unit. A 550-700 sq. ft. room will need a 14000 BTU unit. See our ptac size and capacity page for more info.