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No idea of your budget or what your front speakers are, but Revel makes in walls that are probably at least pretty decent along with B&W among others. A bit more affordable and probably fine for surround duty might be Definitive Tech, Paradigm, PSB, and Polk. Unless you're gonna get really serious about surround music I wouldn't sweat it too much as any of these would likely be more than fine. Best of luck on the dark side.