WD 320GB 2.5'' 8MB SATA 6Gbs 5400RPM Ref WD3200LPVX.
Price: £50.39 from Euroffice
WD 4TB 3.5'' 64MB RED SATA 6Gbs 5400RPM Ref WD40EFRX.
WD 500GB 2.5'' 8MB SATA 6Gbs 5400RPM Ref WD5000LPVX.
WD 1TB 3.5'' 64MB SATA 6Gbs 7200RPM Ref WD10EZEX.