Get it now, worry about it later
I know how you feel. There is a lab mix and a border collie that I often see at the dog park, and they are so sweet, and Stella loves them.
I also met an American Bulldog pup and practically had to tear myself away from him. His face was irresistible.
There is no way I can have 5 dogs, especially with two of them being over 50 pounds. Even so - it's so tempting.