What is a good dog breed to get?

For somebody who has had dogs in the past. and who can give lots of time walking the dog. And spend lots of time looking after the dog and training.
Update: I have been thinking about adopting a border collie. I have the space and time
Update 2: Umm how about I live in the USA west. And I have a huge house and huge garden. And I am rich. The dog would get everything it needs. OH AND BY THE WAY I WOULD CARE ABOUT THE DOG!!! I WOULD WALK IT EVERYDAY! LOTS OF EXERCISE
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