Difference btw is porcelain is much more stronger material than ceramic. My preference would be more toward the porcelain especially on floors.

I have tumbled travertine (basically a form of marble) in the master bedroom and a marble mosaic in the master bath. It is higher maintenance. It stains and it wears differently in different areas. I am not doing natural stone in my new home. There are some fantastic tiles now that mimic all the stones, and a good quality porcelain tile will be very durable. Some ceramic wall tiles are "weaker" but I have had excellent luck with porcelain tile. Granite floors. Sure. But as people have said they also require maintenance like periodic sealing etc. In a house that size you don't want a different kind of floor in every room. I would stick to one or perhaps two types of floor tile in the main rooms. You can get away with additional types on walls in the bathrooms but I would keep the floors consistent. As far as cost goes, there is a very broad range of tiles and stones. In my shopping I have found some very good high quality floor tiles for reasonable prices. Stone has priced out higher...at least the ones I have looked at. Good luck!

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