(Corrects first paragraph to make clear dilemma means investment bankers have to "overlook" concerns, not "heed" them): (Reuters) - Tesla Inc (TSLA.O) Chief Executive Elon Musk’s contemplated $72 billion take-private deal is presenting investment bankers with a dilemma: overlook concerns about how feasible it is or risk missing out on what could be this year’s biggest and most high-profile acquisition. Musk did not just catch investors and analysts off guard earlier this month by announcing on Twitter he was considering taking the U.S. electric car maker private.