all of your suggested solutions seem fine, so just pick one you like.

I would suggest asking on the Kitchen forum.

I think either pendant combination - copper/black or nickel/black would suit and obviously the nickel would compliment your appliances more, but if you are not afraid of matching metals, the copper may be different. In regards to the hardware, I would wait for your lighting and then bring home lots of examples. If it were me, I would stick to one metal re: hardware, as you may have enough going on but use different shapes which will make it interesting.

Connie

Since you have perimeter cabinets are encasing your stainless steel appliances - then I would go with stainless steel hardware. It sounds like you are drawing attention to the black island as a focal point. For the dramatic effect you could use cooper hardware. Here are a few example pictures displaying what it might look like. I would try to incorporate the cooper color with objects in your kitchen. It could be something as simple as a cooper tea kettle on top of your stove or cooper salt and pepper shakers.

VILLAGE DUPLEX · More Info

cooper pendant lighting with white cabinets

VILLAGE DUPLEX

yorkshire construction and maintenance · More Info

[yorkshire construction and maintenance[(https://www.houzz.com/photos/yorkshire-construction-and-maintenance-modern-kitchen-phvw-vp~809257)

Your copper pendants will be lovely. I would not do black pulls on the white cabinets. Use brushed nickel - a bit warmer the chrome or stainless.

Remember: less is more...less is more...less is more...remember...getting sleepy...