Calacatta is a popular choice we have installed this your clients though their cabinets were white and not as dark, i feel that it will look nice, but you may want to have lighter cabinets.

Calcatta Gold- Kitchen and First Floor Remodel · More Info

Looks like your floor has warm tones? (It is hard to tell on my screen) but If so i would go with a warm toned counter - also looks like your floor has a lot of movement, if that is the case i would go for an uber simple counter with little to no veining

Honestly, it's so hard to tell because of the showroom lighting. Can you borrow samples to bring home so you can see them together in your own kitchen? You could take some pics and post them if you still want input.

I agree with Shasta. Showroom lighting is not going to be the same as what you have at home. If they won't let you take something home for a day or two you need to find another retailer. I've never dealt with one who wouldn't let me do that.

I'd actually look for something like Calacatta Oro or a quartz that mimics it. Gray veining won't work, IMO, with a white/beige floor and dark espresso cabinets. Take a look at Silestone Et Dor.

Calacatta gold would work.

https://www.google.com/search?

If I were you, I would try to bring the samples first in your home so you could see it with the actual lighting. It is honestly hard to say what better and what's not cause the showroom has different lighting than your house. Let's just err on the safe side.

None of those will look good witht hatvery yellow hued lighting so cahnge the bulbs to LEDs 4000K thenthe whole sapce will take on a different look. I guess to late to talk you out of espresso .