I wanna purchase a dog as a gift!?

Hi every one!
I have a brother and he likes dogs very much! I know that he likes to have big dogs not necessarily aggressive but large and big.
What breed would you recommend and also please let me know from where I can buy that. Which country is the source and do you know any seller or not!

Regards,
Reza
Update: He is single and he has very large house, not apartment. I wanna have this dog as a surprise for him. That's the reason why I don't want to ask him...
Update 2: Now, if I ask you what breed is the largest, biggest and most huge breed in the world, what would you say?!
Mastiff?! Irish Wolfhound?! What?!
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