WD RE 2TB SATA 6Gb/s 64MB 3.5'' 7200RPM HDD Ref WD2000FYYZ.
Price: £167.72 from Euroffice
WD 1TB 3.5'' 64MB SATA 6Gbs 7200RPM Ref WD10EZEX.
WD 4TB 3.5'' 64MB RED SATA 6Gbs 5400RPM Ref WD40EFRX.
WD 320GB 2.5'' 8MB SATA 6Gbs 5400RPM Ref WD3200LPVX.