In my house, we have wood, carpet, and stone flooring.
Throughout almost all of the house we have Iroko (aka Kimbala) hardwood with radiant heating and cooling in every room that has the hardwood. The Iroko wood itself ran about $45/sq ft when we bought put it in three years ago. The addition of the radiant heating and cooling system cost another $15/sq ft bringing the total cost to about $60/sq ft.
In our bathrooms we have slate flooring. We don't have square cut tiles, but rather randomly broken slabs. That cost about $30/sq ft. We also have the radiant heating and cooling system in the bathrooms which brought the total cost to about $45/sq ft for each bathroom.
In the home theater we went with carpet because it is a lot better than hardwood or stone acoustically speaking. The carpet in there is fairly short, and cost something like $15/sq ft.
We went with fairly rare wood that from what I understand is now considered endangered, so that really drove the price up. Before the Iroko we had Bamboo flooring, which was nice except for the fact that it scratches really easily (dropping a fork leave permanent marks on it).
To the OP: the refinished flooring looks wonderful. Kudos to you for doing it yourself, everyone in my family would say "screw it, call a contractor and have them do it."
-Don