Wait until everything is installed first. The material colors may look different once installed in your home's lighting.

Ditto Sina comment. We wait till most of it is in place to decide.

I’d suggest you get samples of everything and bring them to a BM dealer for suggestions. Colours look different on a monitor than in person and vary with your light and exposure. I also agree with getting things installed first but, I doubt they’ll install the vanity until the walls are painted. Get some recommendations and absolutely check the colour in your room, with your tile and lights. I’d probably want a lighter colour than a warm grey (maybe something like Cloud Cover) to keep the room bright.