I've been hunting around for a NAS server and these are highly rated. Better performance, quality and features than the equivalent Netgear stuff. This is the best price I've found using a quidco voucher code QUIDCO686 for £10 off, runs out tomorrow though! (18th july ).
£145.99 delivered, plus 3% quidco.
Note this is a bare server so you will have to add your own hard drives (up to 2 x 2Gb). I suggest getting the Samsung 2 x 1Gb HD103SJ drives from Scan for £84.59 (deal of the day) as these have been tested by Synology - check the Synology website for recommended compatible drives!
Budget-friendly 2-bay NAS server for Home and Small Business
Synology Disk Station DS210jis designed to provide a cost-effective file storage and backup solution with RAID protection for home users. The system firmware, Synology DiskStation Manager 2.2, delivers rich features for multimedia enjoyments, worry-free backup, Internet sharing, and energy-saving options.