Scan appear to be the first online retailer offering the Samsung F4 2TB drive and they have it on today only offer. This is the first 2TB drive to use 667GB platters which leads to significantly improved performance compared to other 2TB drives. Certainly well worth the extra £10 compared to other 2TB drives.
Scroll to about half way down the today only page and choose the 2TB Samsung HD204UI/Z4, SpinPoint EcoGreen F4EG SATA 3Gb/s, 32MB Cache, 8.9 ms, NCQ. It also comes bundled with an Akasa SATA cable.