1TB Samsung HD103SJ Spinpoint F3, SATA 3Gb/s, 7200rpm, 32MB Cache, 8.9ms, NCQ for £37.79 on today only.
This is an excellent drive and is arguanly the best drive you can get for this price. It is comparable in performance with WD caviar black, however the caviar black has better random read and write times, and has a 5 year warrenty, this only has a 3 years (still plenty imo)
However this is cheap enough to buy two and stripe in RAID to make it really quick!
Remember free postage for AV forumn members which is free to sign up too.