I've painted lots of golden oak cabinets in three houses now! Hidden hinges also called European hinges are a huge update. You have to take hinges off to paint anyway so instead of putting the old ones on you can fill the holes and replace them with European style hinges. There is a special type of drill bit that counter sinks an appropriate sized hole to accept the European hinge. It would be easy to find at a big box store along with the hinges themselves.
When I’m talking about metals, I consider the silver metals as one grouping. So, when you have stainless appliances (silver), a chrome faucet (silver) and brushed nickel lighting (silver) those all count as one metal in my book- SILVER. I personally think Nickel is the most timeless of the metals. Brass has really gained in popularity with interior designers, but is probably a trendier choice. I’ve seen a rise in the popularity of black hardware especially in this age of farmhouse- EVERYTHING (Thanks Chip and Joanna). I think every room in your house should have a little black in it, so if you can bring in the black with your second metal in your kitchen, DO IT!!