What big dog would be ok for a first time owner?

I've never owned a dog before but here are some things about me:

  • I've socialized with and handled different dog breeds. My favorite one was a female GSP.
  • I like going outside and exercising a lot. I hate the traditional ''stay at home often'' lifestyle. I'm generally a very active person.
  • I do have a small garden and a park just a couple blocks away.
  • Overall very sociable person that makes friends easier than others

For a future first time dog owner (and a very active person), what big dog would you say it's best suitable for me?

What big dog would be ok for a first time owner?
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