Aren't the pictures for the Wolfhound and the Water Spaniel mixed up (and the others as well)?
I've always been partial to the Irish Wolfhound, I like the "ragged" appearance of it, and I love big dogs.
But I guess if I were to get a XXL dog, I'd get a Great Dane before the Wolfhound, because I like the mastiff-family dogs a lot, and my girlfriend loves Great Danes. You know the most accurate name for the breed would have actually been the "German Mastiff" and not the Great Dane, because from what I've read about the breed - it's breeding origins have nothing to do with Denmark.
Another large dog breed I quite fancy is the Anatolian Shepherd, which isn't as large as a Great Dane, but still a very large dog breed: