The obvious picks might also be the right picks.Wall Street loves to hunt for hidden gems. But sometimes the best investments are hiding in plain sight -- the dominant players everyone already knows, but for which few appreciate just how much runway remains. As artificial intelligence (AI) spending accelerates into 2026, these three companies sit at the center of that capital flow.Here's why I think these three AI contenders are the best buys in the space right now. The infrastructure backboneNvidia (NVDA + ...