A dark quartz countertop could give you great contrast if you plan on keeping the lower cabinets. Quartz is one of the most durable, can take a hot pot, doesn't scar and requires minimal care. (All other stone types have limitations and require extra work.) Daytime photos would give a better idea of what you have in the way of upper cabinets and light fixtures, how much light you get. Also, need some comment on your decorating style -- modern/cottage/traditional, etc. -- and color preferences. What rooms does this kitchen connect to? In the meantime, look into replacing the cabinet doors. These look somewhat 70s, and you may enjoy a wood or a color. There are a lot of companies that specialize in refacing cabinets. Some glass doors might be interesting. Search houzz for kitchens you like; that will help you focus on what changes you want to make and will help us make suggestions.

Maybe a gloss light grey subway tile? Glass mosaics can look stunning but there are a lot of grout lines to keep clean, particularly behind the stove.

The only way to tell is to look at samples of each material adjacent to each other in the location of your new kitchen. There are too many variables with lighting, photography, and screen adjustment to provide a valid opinion online. Your benchtop will be there for a long time so pay the extra dollars if you love the most expensive one and it works well with the other materials, otherwise you will be reminded of your compromise everytime you use your kitchen. Best of luck, Dr Retro House Calls

A darker benchtop in the scullery would look fine and more importantly suit your lifestyle. Go for it.