Belkin’s back in the Mac peripheral management game with the Thunderbolt 2 Express Dock HD with Cable ($300). This new dock lets users plug in up to eight devices to take advantage of fast Thunderbolt 2 technology: this time, it transfers files at up to 20 Gbps, doubling the performance of Belkin’s last Thunderbolt dock, and quadrupling the speed of USB 3.0. A slim, lightweight dock with a brushed aluminum body, Belkin’s new dock…