2. HP Pro 6305 A6
HP holds the title for best-selling brand of PCs for the month of March and holds five of the top 10 most sold desktops. The Pro 6305 A6 model running on a 3.6-GHz AMD dual-core processor was the most popular of them all. Of the four desktops available in HP's 6000 line, the 6305 is the most budget-friendly and the only one that does not run on a quad-core processor.