The first thing I require each of my clients to do before even starting the design layout is to choose their appliances. Your kitchen designer will need the manufacturer's specifications to know what size to make the cabinets to accommodate them. Be aware that there is required distances needed around and island, typically 36" up to 48" depending on placements of appliances. This will dictate the size and shape of the island. Clean lines, simplicity, innovative materials like glass countertops, exotic woods or Italian veneer slab doors, flip or lift up doors can add unexpected touches to a modern/ contemporary space. Here are some photos of one of my favorite Euro Modern kitchen I did for one of my clients not long ago.

Sorry, don't think it fits, The prongs on the light give it a more circular shape but you have this over a beautiful oblong bench. Always rectangular or oblong over rectangular. And the dark ends of the bulbs will create shadows, not so good in a work space. Used to work in lighting for a few years and it always comes down to what makes you happy. I would have tried to steer you in a different direction, Hope this helps.

My new kitchen will be light grey cabinets, white and grey stone bench tops. My current dining table is a clear glass top, black leather chairs with chrome legs/framing. I love these gold polished glass pendants for over my island bench but will they look okay with my dining suite or is it too different? I can go for the grey glass lights but they are quite opaque during the day.

Um why ? I'd do a coffee table , and have the light maybe 1 metre or less from the ceiling . The second one I'd just balance the first one , so if the first one is say 2.5 metres from one wall , hang the other 2.5 metres from another wall . The lights are really nice -- you would want them to be seen , rather than highlighting a couch IMO .