Gateway was never known as a design leader in the PC space. But the computer maker embraced the all-in-one desktop movement several years ago, and it's produced some of the best-looking PCs. Case in point: the Gateway One AIO, first released in 2007, and featuring a smooth, jet-black finish and a 19-inch display. And unlike other AIO desktops, which typically use a stand or pedestal for support, the Gateway One's case is solid from top to bottom. While the Gateway One series is still around today, the first edition of this brand was the best.