I happen to like the W8 Preview Version so far. It's not only a "tablet version" OS. You can easily access your desktop on your computer from the "home" screen.
It runs faster and crisper on my Dell laptop than any other version of windows so far (Intel 5 first generation, 8 GB memory, ATI 5400 series dedicated graphics)
As far as Windows Media Center goes, check here: »news.cnet.com/8301-10805_3-57445 ··· preview/