This ACER Aspire 5732Z has an excellent specification at a very good price. click here
4gb Ram - 500GB hard drive etc. Win 7 (64bit)
My son got this for University a few months back at Tesco for £399. I think you will find that Ebuyer is the cheapest for this Spec.
Beware of the cheaper prices in this list as the spec. is different - although same laptop some have only 3GB ram and some have 250gb or 320gb hard drive. - click here