Have a shuftie on the Dell website for their Outlet. You can pick up bargains there where people have returned laptops when they have chaned their minds. Also bear in mind that you may need to add:
Laptop case (Tescos)
Mouse (
SVP: DVD-R & CDR - Blank Media: Reviews and Advice do some great retractable ones)
USB 2.0 hub (again SVP)
Wireless network adapter (SVP if it isn't already in-built)
Card reader (SVP if it isn't already in-built)
Alternatively I think JAG was selling one on here recently that was well-specced. Dunno if it sold or not. Might be worth a PM.