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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 your unit is too large for the space of your home, it will switch on and off repeatedly, wasting energy and costing you money. If your home is 1,600 square feet, a 2.5 ton air conditioner will cool it well. This will cost between $3,000 and $5,000. There are platinum models that could potentially cost $10,000, but these are rarely necessary.