Starbucks has been in the news, but this lesser-known coffee chain has much bigger opportunities.Starbucks made big news last week with its poaching of Chipotle Mexican Grill's superstar CEO Brian Niccol. Starbucks stock shot up more than 20% after the announcement, and it was a shot of caffeine that the coffee king has been desperately needing.Investors have confidence in Niccol's ability to get Starbucks back to growth, but it's somewhat premature. He's not even starting until September, and it's going to ...