The HP Z1 is a beauty of a 27in all-in-one PC. Not only is it meticulously built and the only one of its size and class to offer height adjustment, but it’s packed with connectivity and features like an adjustable 1080p webcam. It’s also the only AIO that’s fully upgradeable – in fact it’s easier to upgrade the Z1 than any other PC we’ve ever reviewed. All this is complemented by a gorgeous 27in, 10-bit, 2,560 x 1,440 IPS display and stunningly good speakers. Throw in its workstation certification, and it justifies its premium pricing.