I'd pick the cupboard white first. Pick what you love. Then get the wall colour tinted to match the cupboards. Nothing worse than mismatched whites. Either match them or go a contrast on the wall.

It depends on the look you're trying to achieve. For a contemporary and streamline look, I would select Dulux natural white for the kitchen cabinetry. Or, if you want the kitchen to stand out, I would suggest to choose a contrasting colour with the walls. A great way is to select your material and colours would be to take your stone and wall colour sample into a paint trade centre or hardware store where you can put them against possible options. Another way, is to have the stone, natural white paint colour in your hands, put them alongside the Jarrah floor and possible options. I'm not familiar with your style, existing furniture or personality so I'm taking a stab in the dark - but because your benchtop material looks like a cool grey, I would suggest to also choose a cool grey (like Dulux Sky Painting) for your cabinetry. Best of luck!

Take a door off and head to Bunnings. They'll colour match and tell you the closest paint colour.

You could have one side of galley kitchen cabinets in a richer shade of white (I'll have to start looking at the choices) and the opposite side in a grey. Will you have overheads too? Then the subway tiles in a softer shade of grey than the grey lower cabinets. I'd love to see photo of door handles.