I'm currently using a 2011 Mac mini 2.7GHz Dual-Core Intel i7, 8GB 1866MHz, Kingston Hyper X, 240GB OCZ Vertex 3 MAX IOPS, 750GB 7200RPM Western Digital Scorpio Black as my media gateway. This system is running Windows 7 Professional 64-bit, Media Center Master, Media Browser and Windows Media Center on the 240GB OCZ Vertex 3 MAX IOPS with AHCI enabled. (Why?, because this makes the device appliance like in operation. TV is available faster than the Comcast DVR.) Currently, the 750GB Western Digital Scorpio Black is the Windows Media Center recording drive. A LaCie Thunderbolt Little Big Disk is media storage drive. The 2011 Mac mini is connected to a Netgear ProSage 10/100/1000 switch along with two (2) SiliconDust HDHomeRun Primes and two (2) Microsoft Xbox 360 4GB. The HDHomeRun Primes provide six (6) Cable Labs certified CableCARD tuners available for use with Windows Media Center. The Xbox 360 4GB serve as Windows Media Center Extenders at each TV.
What does all this provide? The 2011 Mac mini is installed headless in the open home entertainment shelf with an Xbox 360 4GB. The other hardware is hidden away (under the entertainment center). The wife can now record up to 6 shows at once. At this time, playback is only limited by the number of Xbox 360 4B extenders and does not impact recording. Our whole DVD and Blu-ray collection is displayed elegantly with titles, descriptions, ratings, synopsis, backdrops and covers using Media Browser Neo. The whole recent iTunes collection is available in Windows Media Center as well. The setup is all easily controlled with a Logitech Harmony One Remote.
In short, with Windows 7 64-bit under bootcamp the 2011 Mac mini is already a great HTPC well suited for the home entertainment shelf.