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Dell XPS 8500 is a dream desktop
In case you haven't noticed, I like Dell PCs, and this one might be my favorite desktop ever. Inside, it's clean, uncluttered, and incredibly easy to work with. That sort of easy upgradeability is the point of a desktop machine, and Dell gets that.
This box has a 3rd Generation i7 processor and a couple of SSDs, making it wicked fast. It's also been flawless with every build of Windows 8 and Windows 8.1 and even has a good selection of Windows 8 drivers. The killer feature in Windows 8.1 for me is its vastly improved multi-monitor support, which is ideal for desktops. I might replace this box someday, but it won't be soon.