I don't think you can go wrong with a large timber door. The colour should contrast with the granite nicely and will even help soften all the colder surfaces. Have you seen any doors you like? https://www.houzz.com.au/products/front-doors-prbr0-br~t_10816

I am about to start some alterations and the front door is currently dark violet purple but soon to be black. I will however be retaining the natural rimu on the inside even though my kitchen walls are dark charcoal currently. I like them so much the new kitchen will have the same coloured walls. The new sliding windows in the kitchen have a pine frame so won't match the rest. I am going to paint it dark charcoal too, with the cedar sliders and rimu finishing.

Thanks everyone! It is kinda tricky because we want the screen/security on the outside so as not to "ruin" the nice look. But so far those that have come to quote said it can only be done inside. Which does defeat the purpose of having beautiful doors. We'll keep googling and calling!

Oklouise and Sirius, thanks for the ideas. Actually the first one could work us very well, removing part of the wall and having a partition instead of a door. A lot more work but we are pretty handy. Regarding the barn door, most of the people I talked to agreed it might date quickly, unless I use a different mechanism than the ubiquitous black one you see everywhere,maybe.