Does the foyer run directly into the kitchen? It doesn't seem to and if it doesn't I think you're okay using a different size. However it depends on the tile in question.

Pick a FLOOR!!!

One of the woods / no tile.Id go with the oak . It's in front of you. Where did cypress come from?!

Never piecemeal flooring. If you must? Buy all you may ever need.

Your only other option is slate in the foyer and kitchen .

Something is a do over or its patcwork again

Sina - the foyer does run directly into the kitchen. What you are seeing in picture number 3 is a sitting area in my kitchen.

Jan: Thank you, I am leaning towards a "do over" right now. Replacing foyer, dining room, and family room with new wood flooring. Just need to sell my husband on it..... Cypress came from a decorating show that featured a house with Australian Cypress. I thought I loved it...not so much now.

I think 18 x 18 would be too large in scale for the foyer. I agree with Jan; do you like the oak or cypress better? Choose your favorite of those two and continue it everywhere else you plan to change the flooring, leaving the kitchen as is since it is new. If you go with the cypress, you may be able to strip and lighten the oak to be a closer match. But you say you want to darken the stairs, so maybe you should go with darker oak and see if the cypress can be striped and made darker to match it.

At this point, I would suggest picking a wood and going with it. You have already "renovated" yourself into a corner. You have 4 different floors inside of 20 linear feet. The only way to get this to look "less patchworky" is to remove two (the best would be three...but it doesn't sound like that's an option) and replace it with ONE. Then you are down to THREE floors inside of 20 linear feet. Doesn't sound that great does it? That's why you want to remove THREE floors and replace with one.

Personally I prefer tile/stone in kitchens (I live in Canada which means snow and "wet" are things we are sensitive to) and then wood elsewhere. You have just discovered what goes on in the flooring world. A 'man made floor' (tile, factory finished hardwood, laminate, vinyl, etc) will be produced/available for around 18 months...and then it is gone forever.

I'm sorry you find yourself in this predicament. This is the way of man-made flooring. It is here today and gone tomorrow. The good news is, you can blame your husband (tongue firmly in cheek;-) and get the entire downstairs refinished in a SINGLE hardwood! Yah! Total score! :-P

Leave the kitchen tile....it is acceptable/allowed to have kitchens/baths in a different material. I would source more of the oak and then have everything refinished all at once.

Do NOT touch your stairs until you have made your decision. Find a HIGH end wood flooring professional who can source everything - including a finishing carpenter to do all the stair work you need.