NEW YORK CITY.- A massive cut-glaze wine jar of the Xi Xia Period (1028-1227 AD), from the Ellsworth collection, is to be sold at Christie's Chinese ceramics sale today. This 20-in., tapering ovoid masterpiece is expected to bring between $200,000 and $300,000.  Among other sale highlights are a superb Meiping of the Northern Song dynasty (960-1127 AD), estimated at $280,000-$350,000, and a rare molded blue and white stemcup expected to sell for $150,000-$180,000. The stemcup, either of Late Yuan or Early Ming origin (14th century AD), is beautifully illustrated with a single magnificent dragon, and it has a chrysanthemum center medallion. Auction mavens have seen magnificent Sancai Tang horses in the past, but the figure of a Ferghana horse at Christie's is truly exceptional. Standing over 25 inches tall, the horse is incredibly well glazed and most finely proportioned. It is not surprising that it is expected to take the hammer above $500,000.