Judging colours from photos is fraught with danger as they appear different on different devices. And choosing whites is not easy. However I’ve just gone through white selections in my renovation and have warm greys in the house. I narrowed down to Casper White Quarter or Lexicon Quarter. Both will work with warm grey. Sounds like Casper for you as you already like it!

Yeah I know what you mean... I have to paint it anyway as it needs repainting and the colour that is there has a pink undertone which really bothers me. not a pink person at all... So you would suggest just staying with an antique white or something and just adding all my colour with accessories?

I like the colours you’ve suggested. I find neutrals restful. Do you have a sample of your cabinetry? An easy way to get a coordinated look, without whites clashing, is to have the white colour matched at the paint shop to the cabinetry. The colour match will tell you if White Beach is on the right track. I’d consider a more plainer white for the trim ie Natural White as suggested above or Berkshire White. For your splashback - could the budget stretch to the benchtop material? If not a tile colour that picks up one of the benchtop fleck colours will give you a coordinated look. Sounds lovely. Come back and post the completed pics.

Getting professional help would be wise , I think painting all your trims in the garage colour and the porch cover would look beautiful, you can see from this inspiration photo how beautiful the stone looks with the lighter colour, just a few ideas for colour combinations that go with your stone.