Next up is Nuvasive (Nasdaq: NUVA ), a medical equipment company that supplies devices for noninvasive spinal surgery. Nuvasive has yet to turn a profit, but that statistic should probably change next year. The firm's top-line revenue has been growing at a rapid rate - revenue increased more than 50% last quarter. The stock has been on a tear, gaining 55% in the first three quarters of 2007. NUVA will supply a high growth aspect to an investor's portfolio. "