househappy, the cedar beams you see in the photo are stained with Early American. As you can see, they blend with the flooring and the door trim (which is stained with SW Walnut Wainscott). Early American on oak flooring won't be as dark and a touch of orange will show thru.
Your flooring guys will have several cans of left over stains and before they begin, will/should stain patches of the floor for you to see (at least 1ft square). They'll sand it off before starting after you select a color. We had enough stains around, so I played on a scrap piece of flooring before that day - but we still let them put down the various stains for me to see.
Like gabeach stated, the paint store will be happy to do test samples also - I did this on the cedar before deciding. They'll do the already mixed for free, but if you want to see a speciality mix (like Walnut Wainscott) you'll have to buy a quart.
Q
tile
Q