The latest Beats by Dre competitor has arrived in Audiovox's new 808 Studio Headphones ($130), which feature the now-requisite plastic arc frame and over-ear cushioning expected of Beats-alikes, here in three color options: glossy black, glossy white, and matte black. You still get 40mm drivers inside, plus two sets of cables -- one with a one-button remote and mic, the other without -- a carrying case, and 1/8" adapter. The key differentiators…