6. HP ZBook 15
The ZBook line is Hewlett-Packard's Windows 7-only line of "mobile workstations," available in a range of screen sizes. My pick is the 15-inch model, which comes with a 2.7GHz Core i7, 8GB of RAM, a 750GB hard drive, rewritable DVD drive, and a 15.6-inch screen with 2GB of video RAM. Ports include one Thunderbolt, three USB 3, one USB 2, one DisplayPort, one VGA, one Ethernet, and one MicroSD, as well as one multiformat memory card reader.