As you have found out, Miss Dior has not been reformulated, but killed. Simply, what you're smelling now is the commercially successful fruity-floral Miss Dior Cherie, which has been simply renamed Miss Dior.
Chypres are now nearly extinct, but still, I feel there's enough green stuff around that you may still find something worthy. How's your feeling about the old workhorses of Chanel, Cristalle and No 19? And about the recently reintroduced Jacomo Silences? I was also going to say Ormonde Jayne Tiare, but that is very expensive.