It is worth shopping around. Have a look at http://www.itcsales.co.uk/acatalog/DELL_E6500_Series.html they take in Dell and others cancelled orders and returns. I just bought one of these after a lot of careful research (I treated myself to the LED screen and solid state hard drive but you don’t have to go that far!) and am very pleased. Mine hadn’t even been opened and has the full 3 year guarantee from Dell. I had resolved to get a thinkpad as they were so well built but the build quality of the current Latitude is probably as good if not better, magnesium shell, brilliant display and great keyboard.
One thing that is in vogue at the moment is shiny screens. I would avoid them if possible unless you like seeing what shirt you are wearing. These have a matt screen and are very good in all lighting conditions. By the way I get 6 hours out of the 9 cell battery that came with it!
Hope this helps