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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.
A Ton in HVAC is a measure of Cooling Rate. You can have 12,000 BTU's per Hour. This is important to denote the rate, because I could rate an air conditioner at 35,000 btu's but what does that mean? a 1 ton system is capable of removing a max of 12,000 btu's per hour at standard conditions.