Competing with fashion earphone maker V-Moda on both design and sonic performance isn't easy, but id America's set to give it a try with Spark ($60), a collection of nine different variations on the "colored metal canalphone" theme. The shape of each aluminum earpiece is the same -- a three-pronged hub stands out from the back of a distinctively ringed barrel -- but the colors change from model to model. Like V-Moda, id America offers conservative…
