Get Freenas Hardware UK. The fact that it uses a thoroughly enterprise file. Freenas is a freebsd based storage platform that utilizes zfs.
Here's some background info about my usage.
Since freenas™ 8.0.2 is based on freebsd 8.2, it supports the same hardware found in the amd64 and i386 sections of the freebsd 8.2 hardware compatibility list. Download the latest freenas iso image from freenas.org, this guide is based on the current 9.3.1 build. On the freenas website the minimum hardware requirements are listed as Top hardware components for freenas nas servers.