Chateau Chaumont-Sur-Loire was by far and away the best I visited and certainly the most "Castle" like.
I especially liked the interior exibitions which showed portraits and photographs of former owners, letters and calling cards from guests etc.
The chateau was actually inhabited as recently as the 1930's.
I really wish I'd had stayed in the valley for a little longer so that I could have visited Chambord and Chenonceaux but I guess it just means I'l have to come back one day :)
I'm in Bordeaux until 7pm tonight when I start my journey to Lisbon, Portugal.
Bordeaux was ok, come here if you like shopping (rue Ste Catherine is the longest retail street in europe at 1.2km long) but bring lots of money!
Steve.