Niveus leads the PC world in creating Windows Media Centerâ€based entertainment systems that even a persnickety A/V connoisseur can embrace. It pioneered the fanless case, using huge heat sinks (those funky side fins) to quietly keep the processor from frying. The new Denali Edition delivers HDTV with pristine video performance (courtesy of the industry-leading Nvidia GeForce 6600GT video card) and near-silent operation (around 20 decibels, about the level of rustling leaves) to gain certification from the independent Imaging Science Foundation research lab, the first Media Center PC to meet this demanding standard for video quality. 3.2GHz Pentium 4; 24-bit/192Khz, eight-channel audio; three TV tuners; $4,600â€$6,300