Excellent, thanks guys. I'm in the UK and probably should have mentioned that initially, but no big deal, I searched for the cheaper ones suggested in the uk stores, but seem only available in the USA. I tried a search myself using the (socket 775 as the sole basis for the MB?) and found this one: http://compare.ebay.co.uk/like/251071126836?var=lv<yp=AllFixedPriceItemTypes&var=sbar&cbt=y
Would that one work for me? And is socket 775 all I need to find on a board discription?