These stocks offer attractive long-term upside potential.Keeping a long-term mindset on a company's opportunities is a major advantage in spotting tomorrow's winners. If you're looking to double your money, or even higher returns, you'll want to focus on companies that are experiencing growth tailwinds in their industry.To help you in your search, three fool.com contributors recently selected three stocks with above-average upside over the next five years. Read on to learn why Take-Two Interactive (TTWO -0. ...