I've been looking for a good price on the ReadyNAS NV+ and think i've found the best one due to current promotions.
Play.com already have it at a fairly good price of £579.99
Then use attached voucher for 5% off making it £550.99
quidco at 4% = £23.20
And netgear are currently running a promotion for £50 cashback.http://www.netgear.co.uk/cashback_promotion2.php
Other ReadyNAS NV+ models (except diskless) are in promotion but the RND4250 offers best GB/£ and upgrade potential as two free drive bays are left.