A handicapping dilemma familiar to many horseplayers has arisen Sunday with the arrival of Cactus Ridge at Ellis Park.Cactus Ridge has been spectacular in winning both of his career starts, including his most recent in which he earned a huge Beyer Speed Figure. But that latest victory came at Canterbury Park, and bettors will have to decide whether that race is on a genuine par with the kinds of races in which his eight 2-year-old rivals in the $100,000 James C. Ellis Juvenile have been competing.