Considering how well artificial intelligence (AI) stocks have done over the past two years, it's hard to imagine some of them going even higher. However, this industry still has significant tailwinds as we have barely scratched the surface of what is possible with AI.

That sets the table for continued growth over the coming years. Analysts estimate that Nvidia will grow earnings by an average of 38% annually for the next three to five years. Today, Nvidia trades at a forward P/E ratio of 51, a rock-solid value for its anticipated growth.

Having said that, if I were to choose just one stock to invest in AI, it would have to be Amazon ( AMZN -0.32%). It offers an excellent combination of growth potential and safety, and there's a solid case to be made that it is the most attractively valued of the megacap tech stocks right now.

For its first few years as a public company, Palantir Technologies (NASDAQ: PLTR) struggled mightily to capture meaningful market share in the enterprise software space. The company's sluggish growth and heavy reliance on lumpy federal contracts fueled a perception that Palantir was really more of a government consulting operation and less so a legitimate player in the software arena.

Both Palantir and SoundHound AI boast strong sales and healthy financials that have contributed to their triple-digit percentage share price gains over the past year. Palantir's revenue grew by 30% year over year in the third quarter,