Get Porcelain Tile, it is much stronger than ceramic. As Fishsmith says, get a high grade. I think 6 is the highest. Also, the larger the tile, the more chance it will crack on a floor that moves or is uneven.
If the subfloor is solid as a rock and level, you should not have a problem. Also, I wouldn't tile over wood. Make sure it is on cement, or cement board (hardi or durock)
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