I would do a white quartz with the taupey light grey that you were thinking of.....

I assume your style is traditional, based on the hardware selection. Quartz is better suited for modern spaces. Personally, I'd go for a stone perimeter countertop that offers a little color or a lot, depending on what look you are striving for. I like your choices.

If you want to stay in the gray range, consider quartzite. It is harder than marble but bears a strong resemblance without being overstated. Here's a kitchen with a similar look but gray tile flooring. I suppose up close and personal, the countertop would stand out more, but to me the quartzite gets lost in the white of the cabinets.

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Here's one that used oil rubbed soapstone. The finish is not harsh or glaring in the light. Soapstone is softer than granite but the good news is that minor scratches can be buffed out by hand.

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Here's one with bianco antico countertops. I also like the taupy gray backsplash to break up the monotone white. Alaska white is also another similar to bianco antico. Like delicatus white, both stones are beautiful but their patterns can make a big statement.

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Or if you want to take a chance, here's one with all walnut countertops. I do like the warmth of this kitchen but it is not for the faint of heart.

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