Hi, Ali, it sounds like you are on the right track. It is always difficult to comment on a particular colour grouping when they are only seen on a Screen. Using Grey or Whites will always come down to personal preference, so my advice would be just make sure that your specific Grey or White does not clash with your stone colour, but complements it.

I would suggest you start by deciding on the stone that you want to use, (and even putting a specific Slab on hold so you are sure of it's colour and pattern). Then work on your cabinetry colour while also taking into account other colours in your space like flooring and walls that will throw their hues into the mix (so make these final selections in your home using all your sample options). At the same time also select your wall colour, (if you are having painted walls), Splashback colour, appliance and handle colours all worked into the mix so all these colours work together.

Your Kitchen designer should also be able to help you once you narrow down options and colours that you like.

Hope this helps,Malcolm.