I actually like that stone with that tile. The whitest stone is called Pure White. Shouldn't be too expensive but it is an upgrade. I would steer clear of black in a bathroom. I have Raven in my laundry and want to smash it on a daily basis. EVERYTHING shows up on it and it constantly looks dirty
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https://forum.homeone.com.au/viewtopic.php?t=79581
Ditto, my old kitchen benchtop was night sky and it sent me barneys!!
We ended up with snow for our benches, i thinks its only 1 level up from standard, It looks white against my white cupboards too.
Good luck and enjoy!!