Today's lightweight business laptops are more than capable of handling serious productivity tasks and even crunching video, but if you need the ultimate in performance for CAD applications, 3D modeling or engineering, a mobile workstation is your best answer. With a weight of 5.8 pounds, Lenovo's 15.5 -inch ThinkPad W540 isn't designed for frequent travelers, but it provides such high-end features a 1920 x 1080 display, speedy Nvidia Quadro graphics and enough processing power for the most demanding tasks.