Investors should consider adding growth stocks to their portfolio to complement the blue chip stocks that dominate major market indexes. Tech companies with excellent growth prospects and strong products can deliver returns that outpace the market over the long term, but it's important to buy shares before they launch to expensive valuations. If you're making contributions to a Roth IRA for last year, these two stocks could be a great way to deploy $1,000 for long-term growth.DynatraceDynatrace (DT -1.92%) ...