There are hundreds of pictures on the web of exactly what you're looking for.

Just google it. Simple. Done.

Dyan, I have no idea what "Special Walnut" means. I imagine it's just a creative way to say medium brown. Sort of like how "cherries in the snow" lip color is just a fancy name for red!

Do test. That will be the best way to make your decision. Even so, I intuit that dark won't be the best for your rooms.

Do you really have to rip out what you have and replace? I would think a refinish would be more economical.

ETA: You have a very comfortable looking home. Hardwoods in the living area will be awesome.

What you have now is very classic. I am doing white oak as well and am at pains to ensure I get a medium brown. Much as I like the look of the darker colors, they are a no-no from a cleaning and longevity standpoint. The floors Manon posted upthread are pretty close to perfect. Remember chances are you will have area rugs covering up big parts of the floor. How these floors look in a bare room is not the point. It's how they look all furnished and lived in.

Ah! Well, you've got yourself a project. It's a process that will involve weighing the costs and benefits, for sure.

White oak will have a tendency to yellow over time with lighter stains. Red oak will lean red/pink with a lighter stain. The darker the stain, the less likely the woods will reveal their natural colors as they patina. So, I think a middle of the road brown stain is the happy spot. But again - you have to test.

Thank you, Manon (for some reason I feel like downloading Manon du Printemps ;-)

^ Rita, you always brighten my day!