An art market barometer reading will be taken May 4 and 5 when the Impressionist and Modern Art sales are in full swing in New York.

The return of minimum price guarantees has helped push top-tier works of art back to market. Among the offerings is the Mrs. Sidney Francis Brody collection which could fetch $150 million alone.

Works by modern masters Dali and Rodin may reach record prices at Sotheby's while Christie's has Picasso's "Nude, Green Leaves," estimated to shoot to $90 million.