We have Caesarstone in Misty Carrera on our island. It has a slight warm gray hue, which works well in our kitchen, and it's very durable against us and our kids.

I think what you have done is amazing - so fresh and so modern - it is a great example to people like myself who have an old kitchen with good bones but no longer modern. So many people spend far too much money ripping out usable kitchens, that function well but they think they need to get the new and latest, often just to keep up with the "Jones". You have done an amazing job without the huge cost of replacing all your cabinetry. WELL DONE.

The all black kitchen looks scary as. Maybe because there's no lightness in there at all.

You are so right white is never out of fashion. I would set your budget and then look at your options. If you plan to stay in the house for many years then spend to the top of your budget (if that is going to give you a life time of pleasure), if you plan on being at the home for only a short time / few years then I would go mid range so it looks lovely, will have good resale value but you can invest your well earned money to go towards something else as well. Obviously Marble / Granite is the top of the range but there are so many cheaper and very attractive options these days that look just as good.