Tech stocks dominate the IBD 50 list of elite stocks based on fundamentals and technicals. But many have had long runs. And investors who only pay attention to one sector miss out when market leadership shifts. The latest IBD 50 has four medical stocks, including Danish diabetics products firm Novo Nordisk (NVO), genetic analysis firm Illumina (ILMN), heart valve maker Edwards Lifesciences (EW) and generic drug maker Perrigo (PRGO).