I'm more of a golden retriever guy myself. I have one named Rusty, he's about 70lbs, and he's a Canadian (American) Field Retriever, so he's lankier and redder than the traditional british goldens, which are generally stockier and lighter coloured.
He's the friendliest dog in the world. Such a horrible guard dog. But as a companion, there is no better dog than a retriever.
My buddy also has a couple of rotties, both of which I love like they're my own. One of them is a male rottie mix, and he only weighs about 70lbs. But the female is pure rottie, and she's about 90lbs of muscle. She's a beast. Beautiful dogs, though. They're well trained. I'm always stopping by the house, even when my buddy or his wife aren't home, and since the know me well, the dogs don't care. But I'm sure that if a stranger wanted to come in.... watch out.