Some people like to pimp out their cases: Plexiglas windows, bright lights, and flashy colors. They like to light up their rooms at night with too many cathodes, and they like to get a lot of attention at a LAN party. NZXT Corp was one of the first companies to cater specifically to this audience, with their heavily pre-modified Nemesis and Guardian cases a few years ago, and since then this crowd has grown larger and larger. Meanwhile, other people like to have a stylish, but subdued case. One that performs well, but isn't quite as presumptuous as others. These people need their performance, but also want to be able to have a quiet case when they can. Lately, NZXT has started to serve these consumers as well, as they have expanded greatly upon their Classic series of cases, with a variety of silent and stylish aluminum chassis.
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Source: OCIA.net