Just did a quick "buy" of the Duo without the extras like Mcaffee etc on the Dell website. Comes to just £448.99 including the p&p of - I kid you not - £19.99. Now thats just with the 1yr warranty and the smaller hard drive though. Will wonder if QVC add anything else to the deal other than McAffe like the 2yr Collect & return.
Personally: go direct, live with the smaller drive and buy a backup device!