Gamers have many reasons why they steer clear of desktops from big-name brands, but one of the biggest is the poor expansion. You may have fewer upgrade slots (if any) versus a white label or home-built rig, and you'll frequently have to contend with non-standard parts. HP thinks it can make you reconsider, however. It's refreshing its Omen gaming PCs once again, and the highlight is a completely new Omen X Desktop that promises both the perks of a major company's industrial design with the expansion that you crave. That cube-on-its-side look is not only relatively unique in a sea of generic towers, but genuinely functional. Its three-chamber structure separates hot components while giving you room for expansion that includes dual graphics cards, four tool-free hard drive bays and an M.2 SSD. Also, this is an industry-standard chassis -- HP will sell you the barebones case if you prefer to supply your own internals, and Maingear will even build its own beastly gaming PC around the box this year.