Even though the market ended lower in choppy trading Thursday, many leading stocks managed to score new 52-week highs. Still, the number of new highs dropped off from earlier in the week. Alkermes (ALK) staged an upside reversal and hit its highest levels since March 2006 in more than double its average trade. Thursday's surge puts the stock out of buying ranges from buy points at 20.79 and 21.22. Before the open, the biotech reported fiscal Q3