Calm to a point of almost pure laziness...?
English mastiff all The way!
Really, Mastiffs are beautiful, slow, calm, and extremely affectionate. You have to realize that a English Mastiff is much more messy than the above mentioned dogs, but they are a joy to own, and the attention you get anywhere you go is amazing. Do some research on the breed and never forget, as mentioned above it definitly depends on your living enviornment. Just do some research and see if the Noble Mastiff is right for you.