Helmut is the owner of an original work by the famous artist Salvador Dal, who died back in 1989. Mary is an art dealer. Helmut and Mary enter into a written contract. Mary agrees to pay $3 million for the painting. However, when it comes time for Helmut to deliver the painting to Mary, he suddenly refuses to do so. Yet, Mary really wants the Dal painting because it is a unique piece of surrealism.

If she decides to sue Helmut, then which contractual remedy would be most appropriate? Explain.