After 3 years of faithful service I want to upgrade my Sony Laptop (1.73ghz, 2GB ram, XP, 17" 1400x900 display. I have shortlisted Samsung R780 with i3 processor, 4gb ram, 17"screen (1400 x900) (£660) and Dell Inspiron 1764, I5 processor, 4gb ram , 17" screen (1600 x900) (£630). Mostly used for office applications but also photoediting and occasional DVD film. I'm uncertain about Dell delivery and inspiron case looks dull and dated whereas Samsung a more attractive package. Dell windows 7 is 64 bit but can't seem to find out if Samsung is. Bearing in mind I would like to buy for the next 3 or 4 years will i notice a significant improvement in performance over my Sony and any views on Dell vs Samsung and i3 vs i5 for non video applications?