Barry Gilbert, vice president of Strategy Analytics’ BuyerTRAX, has said that iPhone sales of 1.6 to 1.7 million in the holiday quarter would likely make it the top-selling handset in the U.S. “The iPhone has momentum that is basically unparalleled,” says Gilbert. In a Forbes article comparing sales of the iPhone to the Motorola RAZR, the analyst claims that the iPhone is gaining momentum faster than the now-ubiquitous RAZR, which…