I'm doing this same thing.
I purchased some of the books you listed: Global Art, Houses and Homes around the World.
I also purchased: Children Just Like Me.
After borrowing National Geographic Picture Atlas of our World (1978) from a friend, I decided I had to have my own copy of it despite the fact it is outdated. It is EXCELLENT! It has wonderful photographs, flags, maps, and a nice description of each country. I bought it used on amazon and the most recent edition I could find was 1994. I also bought Window on the World prayer book.
After much debate for just one literature purchase (thinking I will borrow books from the library as we go), I bought Around the World in 80 Tales because is seemed the most young child friendly.
I bought the Wee Sing around the world CD to listen to some music.
I also decided to incorporate animal study into each area we are doing, so I bought The DK Encyclopedia of Animals. I'm going to work on basic classification of animals with my boys.
HTH