How do you feel about cork? So many choices and lighter colors and tones.It is soft, it absorbs sound and is durable. http://www.theflooringlady.com/cork_flooring_in_the_kitchen_000785.html

2" slim slat quartersawn white oak is readily available. Tying in to the existing floors would trigger a refinish of all and you could stain it all for a contrast. Minwax Jacobean is a rich, deep brown and would make your cabinets look great.

If you don't want wood have you thought about Marmoleum? It's lovely, soft underfoot, comes in a zillion colors and works well in vintage homes, Made by forbo and very " green" and friendly to the environment,

"Luxury" or plank vynil is an option, have you thought about that? I am having that put in the living rooms and bedrooms, and it doesn't get cold and can get wet.

You mentioned bamboo. We installed bamboo about 5 years ago. Everything I read an/or heard on bamboo flooring was that it was a great 'green' choice because it grows so quickly. I also understoon it was very durable. After we installed it and lived with it for a while I discovered it isn't as durable as advertised. I found it scratched easily. Our daughter brought her Chocolate Lab over about 2 weeks after it was installed, the dog was excited to see us and imbedded huge scratches in the floor. :( We learned later that bamboo is a hard wood if it is cured for several years. If you choose bamboo make sure it is "cured." If I had it to do over again I think I would choose the new wood-look tile. I really like the look of it and it is durable and easier to keep clean. I know tile is hard and cold, but I have a large area rug under the table and chairs and matching runner in the area where I do most of my work. Good luck.