It's clear that when it comes to operating systems, HP isn't one to play favorites: The company's current lineup includes Windows machines, Chromebooks and even an Android laptop. At the same time, if there's anyone who's been giving Chrome OS a run for its money, it's good ol' Hewlett-Packard. After releasing a pair of aggressively priced laptops, each of them marketed as "Chromebook killers," the company is back, and this time it's taking on Chromeboxes. Here at CES, HP has just announced two miniature Windows desktops, both of which are small and inexpensive enough to compete with Chrome. At the lower end, there's the $180 Stream mini, which has a bright blue, plastic chassis, just like the Stream 11 laptop we reviewed recently. The higher-end Pavilion mini ($320) has a slightly more sophisticated design, though the overall shape is the same -- a 2-inch-high cube with four USB 3.0 ports, an audio jack, HDMI socket and DisplayPort.