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All the above will help, depends how much your need for cooling can justify the cost.
The white external coat is a big plus regardless of internal insulation.
Air flow as BD suggested is a cheap addition , whirlybirds work well.
A roofing blanket and batts would probably be my choice if you can remove your roof sheets and refit.
Sisalation (reflective foil with insulation attatched) is cheap and reasonable, its finished look will depend on how well it's fitted.
For styrofoam sheets I'd recommend the blue high density sheets for effectiveness.
There's a variety of products incorporating sheetmetal with insulation attatched, but expensive for one off, small projects.
Purline is a corrugated sheet with polystyrene attatched, ideal for roofing, easy to fit and with a great finish. Bondor (coolroom panelling) is a flat sheet polystyrene sandwich.
A word of warning about polystyrene though, it WILL retain heat once it's heated and will radiate heat back for hours after the sun goes down. The thicker it is the longer it takes to cool off, the thinner it is the less effective it is at keeping the heat out. NOT a recommended choice without an aircon or refrigeration unit.
Check out major the Insulation companies for something that suits your budget.
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