I just did my hideous honey oak cabinets a light blue-gray and I love them. Depending on the color and the bounce in the kitchen, gray can change color during the day which is kind of cool. I was going to do a darker island as well, but when they were finished, I kept it same color. But I had gold granite that I didn't have the money to replace, at so I had to keep it simple.
But I also like the white and navy idea. Very clean and Chris. It does about a slightly beachier vibe so it depends on the style of your house and other furnishings. If you have an open concept kitchen a lot of Navy in the family room, go for it.

That was crisp, not Chris. Autocorrect, sigh.

You can't go wrong with an all white kitchen. If you need a bit of color, I'd go with grey. A blue island works but it will limit your ability to switch out accents in the future. Grey is more neutral. I like my accent pieces - fabric....blenders....etc to give pizazz...easier to swap out than cabinets!

I would do all white cabinets with a dark island in either the dark grey or navy. I think it looks effective and not so clinical

I'd keep the entire kitchen , island included as white cabinetry and allow myself the total freedom it provides adjacent areas, like the family room or great room. Next best, the pale gray, but with so many other venues for color and texture in the kitchen and those adjacent and usually very visible areas.... .........not really necessary to commit color to the island. JMHO.

all white but I would have chosen cabinet color before countertop and backsplash

This was the inspiration board I had for the open concept space. My first thought was two-tone grey, until I met with the cabinet supplier. I expected more ability to customize my choices, but the only available light grey was much darker then what I was planning on using.
Now I am questioning everything...

Here is the spec layout with all white.

Beautiful choices! All white cabinetry with either grey or navy blue island would work wonderfully in your kitchen.

what about grey cabinets with white island? I've see some beautiful pics on houzz of a lighter island

I like the white better with your quartz (although I feel like there must be one with grayer tones that would go better with both cabinets!). All white could be great, and seems to fit with your vision board, but I think a blue island looks totally gorgeous -- classic and playful at the same time. That's also an easy repaint if you wish for more color flexibility later.

I just post something similar my inspiration pics and my paint choices . I chose Gray Owl BM for cabs and deciding between Whale gray or Hale blue BM for island.

@Mellissa G please tell me the color of your blue sample?

Looks beautiful!

What was the name of the blue?

I don't know the colour, it was a stock cabinet from the supplier.