This has a Best Buy from IT Review, and comes recommended by Computer Active (Sep 2011). It also recommendedby PCPro. It comes installed with a 2tb WD GreenPower drive.
The warrranty last 3 years and is an exclusive deal from Ebuyer. I got £2.17 in cashback from Quidco.
It sounds easy to use and is compatible with Squeezcenter if you have a Logitech Squeeze music playing device. You can also use it with PS3, Xbox 360s and DNLA TVs. It has an iTunes server facility.