Last fall, David Smith�_s Cubi XXVIII became the most expensive contemporary artwork ever sold at auction. Larry Gagosian, bidding on behalf of billionaire Eli Broad, won it at Sotheby�_s for $23.816 million. �_I was prepared, frankly, to pay more than what I bid,�_ Broad told the Website ArtInfo after the sale. The deep-pocketed collector is funding the $60 million expansion of the Los Angeles County Museum of Art, where the Smith is likely to go on display.