Hi Aleta1, youre getting down to the nitty gritty of Interior Design now. Choosing the perfect colour involves addressing many issues...size of your windows, orientation of the house, height of ceilings, size of rooms, purpose for room to name a few. If you have the time I recommend getting a sample pot of full and half strength and try it in a couple of corners of each room. That way you can see how the colour looks at different angles. Good luck.

I would personally stick to white cabinets... I know, not very original... but I think white works best with timber benchtops... and black/white/timber is a fail-proof/timesless combo imo... But if you wanted to inject a bit of colour... and based on your coastal theme description... then I would suggest maybe duck egg blue?... do a search of "duck egg blue kitchen" in photos on Houzz AU

White-matte cabinets (flat panel, not shaker) and white bench (or maybe epoxy sealed marine ply??...siriuskey can tell you about that), mirror splash. Love the ceilings. I personally would go for a modern, stream-line, no handles, integrated appliances look. This space has real potential to be very cool, even with the slate. It doesn't need any more more texture or darkness. This is a nice kitchen, you should be able to sell it on ebay.

I love shades of blue through to green, so I'd take my cue from the deep green-blue throw rug in the Adairs photo. Preferably in a different fabric to velvet to mix up textures a bit. I do like the Morgan and finch diamond cushion too, if you prefer a more colourful option.