TBH have been looking at this for a few weeks now. This drive was £85-£95 start of the year but has now fallen to a nice price. Compared to the 320GB you get more for your money and use the PS3 to its full capacity at this present time. Free delivery and the cheapest i can find, still showing £79.99 over at Play..
Western Digital 500GB 2.5" 5400rpm Scorpio Blue - Max Out Your PS3 - £64.84 Delivered @ Amazon