ZyXEL NSA325v2 from Amazon Germany £72.64 incl delivery using Halifax Clarity Credit Card. Amazon UK price currently £83.34. (Your Amazon account details are accessible on the German/USA/French etc websites)
1.6 GHz CPU / 512 MB RAM
USB 3.0 port in front, 2x USB 2.0 in back
2.5 inch or 3.5 inch HDD, click mechanism for inserting and removing
Up to 4 TB HDD support per slot
New ventilation concept, very quiet
A popular and well reviewed NAS.