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~DR.GREENTHUMB~
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Assuming your vent fan is adequate, I think the general rule is 5000 btu per 1k of lighting...but the climate where you live will play a huge role in that.
The general rule is 3500BTUs per 1000w(with Co2 burner). Myself, I like to have A/C overkill. I'm running a 4-ton Water-Cooled unit, puttiing out 58,000BTUs with 7 lights. So thats 8285.75BTUs per 1000watts!!! I could be running 14 lights at once with the A/C unit i'm running. This is definitely A/C overkill. A 2-ton unit would be working alot to handle 8K especially if you are burning propane for Co2.
Something to keep in mind, if you plan on getting serious A/C for your set-up...
You should consider doing a "closed growing environment", or "CGE". By doing a fully enclosed room you can control environmental factors more precisely. You'll need to invest in a Co2 gen, dehumidifier, Charcoal filter, aswell as your A/C unit. All the air is contained in the garden, so no smells wonder out. This is how the pro's do it.
In a CGE room the air is just recirculated, enriched with Co2, dehumidified, and the smell removed. The air doesn't have to be exchanged with fresh air. The CGE growroom also provides a security blanket against BUGS. It's not perfect, but you'll find pest problems are much easier to control.