I also support the idea of including a few unique national wonders to each civ. Make a good solid core of truly great wonders from around the world, which can be available to everybody, and then give each civ one or two unique wonders all to themselves for flavor--sort of like a couple extra minor unique abilities, but you would have to earn them/build them in order to harness their benefits.
That way more wonders can be included for flavor without spamming the game with lesser wonders.
So for example, Egypt could have the Temple at Karnak and/or the Valley of the Kings, the Arabs could have the Dome of the Rock, the Chinese the Temple of Heaven, Babylon the Ishtar Gate, and so forth.