Most all-in-one PCs get compared to the Apple iMac, and almost all end up falling short in the comparison. The Dell XPS One 27 may actually change that. The PC is built around a high-resolution 2560 x 1440 27-inch display, and has an HDMI port to add a second display. It includes most of the features one would expect on a current-generation PC, including USB 3.0 ports, the option to add a fast Intel Ivy Bridge processor, and an optional Blu-ray drive. It handles graphics very well, and includes a range of entertainment-oriented features, such as a built-in HDTV tuner, and both HDMI and coaxial inputs, which let you use the XPS One's display with a cable box or other peripheral. It also has a handful of nice touches that show Dell really sweated the details: One USB port is designed to provide power even when the computer is asleep or powered down, so you can charge your cellphone without having to turn the computer on. And, in a nod to privacy concerns, the webcam has a sliding cover over its lens, something we've never seen before. Most of the XPS One 27's features put it on par with the current generation 27-inch iMac, which has a similar display, and is available with a processor upgrade that makes it almost as speedy as the XPS One. However, the iMac lacks USB 3.0, a TV tuner, or HDMI input (not to mention the webcam lens cap). It also sells for $2,199 with the processor upgrade, compared to $1,799 for a similarly configured XPS One 27 (the XPS One starts at $1,399, vs. $1,799 for the iMac). If you need to run Apple's OS X, or need some of the iMac's other unique features, such as its Thunderbolt port, the 27-inch iMac may still be a better option. But if you don't, the XPS One 27 is definitely worth considering.