This is the latest model and well over £215 at Amazon, Ebuyer and the rest.
Allowing up to 24TB of storage, dual core and 1GB ram it promises 130MB/sec of read speed and 48MB/sec of write speed.
It includes 3 x USB3, 2 x gigabit ethernet, One SDXC card read (Up to 128 GB) and unlike many it also offers Raid 6.
This comes from business computing world:
Ideal for those who need to safely sync, back-up and share data from all devices – including Windows, MAC OS X, Android, iOS and Linux – the NAS 540 promises security as well as speed, offering efficient protection of files from any possible loss. In the case of a hard disks failure, users can still access files and restore normal RAID protection with the failed disk replaced. Users can also benefit from remote access to the NAS 540, providing the freedom to access files from anywhere in the world. Files can be additionally accessed with any Android or iOS mobile device, allowing the display of visual or audio files on bigger screens. Additional product specifications of the NAS 540 include: Compatible with popular cloud platforms including Google Drive RAID 1, 5, 6 or 10 support Two Ethernet LAN ports with link aggregation capability Fast USB 3.0 ports and RAID-5 configuration SD card slot with the latest SDXC support 1.2 GHz dual-core CPU and 1 GB of DDR3 RAM
For a full spec: http://www.zyxel.com/uk/en/products_services/nas540.shtml
And it's quite a neat looking unit for those that have an eye for aesthetics