Consider also Bondor panels. They are two panels with insulation sandwiched between. They have a stucco type finish for the exterior walls.

Try a slim porcelain sheet in a concrete look finish. The large format size means you'll probably need only one, so there'll be no grout lines. Have a look here, at the Portland 3.0. I think the Kerlite range also does a concrete look and is larger, at 3m long. The other advantage of a porcelain tile over actual concrete, is that you just wipe it down. Concrete is porous and will stain.

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If you use a good quality paint like Dulux Weathershield maybe every 10 years.