Which is the best combination for cooling a metal building in summer (details inside)?

I favor a combination of 1 and 3, but to be honest, it's still going to be bad. I had a steal building in Phoenix with turbine roof ventilators and a powered exhaust fan mounted on the wall and in the dead of summer it was like an oven. What I ended up doing is having foam roofing material sprayed over the whole building, and that made a huge difference. I mean Huge.