Electricity upgrade

I am going to shell out the money to upgrade electricity in my new grow rooms. I want to be able to have some wiggle room to further upgrade down the line without having electrical work done again. I am going to run at minimum 2 48" 8 bulb T5, 1 24" 4bulb T5, 5 fans, 2 400watt MH with ballasts, 2 1000 watt HPS with ballasts. In the future I might want to do 4 400watt MH and 4 1000 watt HPS, chillers, etc. So I'm figuring two 40 amp breakers would be enough but I don't know. So my question is how many breakers? What amps per breaker? Should I get a separate box than the house breakers? Would I have to go through the electric company and get a phase 3?
 
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