Have you been to visit some kitchen showrooms? You can customise the photo search here on Houzz quite a bit. For example, you can simply select [dark wood[(https://www.houzz.com.au/photos/kitchen-design-ideas-with-dark-wood-cabinets-phbr1-bp~t_10444~a_17-103) cabinet finish in the filter options. Then add more filters like floor colour, kitchen layout, cabinet style, wall colour etc if you wish. Leave the benchtop and splashback options open and see what results you get. You can then save any photos that appeal to your ideabook.

We have black pearl granite. Been in around 10 years and looks as good as the day it was installed. Easy to clean and doesn't seem to mark or stain. I would however not use black again as I think white would of looked much better. Granite being a natural product can't be matched up as easily down the track if you decide to add more benches and the like. Each batch can potentially be different.

If your painting the cupboards, I would paint them in Dulux Whisper white. The bench tops I would get granite transformations in and choose the lightest grey from your slate. Backsplash I would also keep light, maybe a light grey or soft khaki subway tile. There is no need to add something to bring the dark colour from the floor, plenty of white kitchens with dark floors. I have used granite transformations before, they basically come in and built a nice crisp stone bench top, squaring of the edges etc...too easy. With regards to cupboards, I would stay away from creamy whites . If your painting the cupboards, that involves a lot of prep work and undercoating. Buy sample pots, paint on large pieces of cardboard, then when your happy with the colour just get the undercoat tinted in the colour you like...then if you still think it needs changing it’s easy. Also I would paint in satin, not gloss.

Pure mineral stone would be my pick, from the two laminate colours mentioned. The Caravelle tiles are the feature, so you would not want a bench top that will compete for attention.