(Image credit: Tom's Hardware) Given the cost and availability issues swirling around RAM, storage, and GPUs since late last year, it can be tough to get excited about building a new PC. But Corsair wants to tempt us back to the building realm by offering up a plethora of PC case options. The company’s 4000 Series cases are expanding to include both an RGB-fronted Frame 4000X RS case ($139 to start) and a Frame 4000D Wood variant ($129 to start). But these are far from static SKUs, as Corsair has a configurator for these cases, which lets you choose from a nearly bafflinig list of options: 12 different front panels (six each in black or white), five different motherboard trays (including an aluminum model with shiny beveled edges), and two different types of PSU shrouds. There’s also a front-panel option with three USB-C ports, and either full-length side panels in glass or mesh.…