After outperforming Nvidia last year, this growth stock still looks attractive.Following a year in which the S&P 500 rose 16% and the Nasdaq Composite jumped 20%, many growth stocks now look overpriced. But if you look close enough, there are a few growth stocks that still look attractive even after last year's big gains. Online broker Interactive Brokers (IBKR +3.20%), which boasts a low-cost and highly automated operation, arguably stands out as one of the few fast-growing companies that still look attrac ...